To be honest I was under the impression such a body was already established and underway. There is a number of people that think that Charles will be a King by committee. This will in many ways determine who is in and who is out.
The Way Ahead group was disbanded about 15 or so years ago.
Personally I expect Charles to set up or have an advisory board in both church and government.
There is an advisory board in the church - it is called the synod.
There is an advisory board in the government - it is called the cabinet.
As someone here has mentioned I expect Charles to do what the Dutch monarchy did and pull all charities and patronages and start from scratch.
I agree - all will be told 'sorry you will no longer have a royal patron' while the many that are named for a royal e.g. The Prince's Trust will be disbanded.
However first they need to do a few housecleaning.
1. Finances - I expect there will be some house moving. Charles were very adamant that they must not be seen to be aloft and greedy. I think there will be the selling off of some small estates and the move of some to government buildings. There will also be a committee set up into the royals investment and financial doings for scrutiny. I expect Windsor and BP to be opened to the public more often.
How much more can they open Windsor - it is open most days of the year now - other than Christmas Day or days when there is a major royal ceremonial taking place.
Buckingham Palace - can only be opened more if it is no longer the home of the monarch or any other royals which would also mean the other 100 or so people who live there would also probably have to lose their homes.
Currently quite a few staff live in at BP. The palace is opened when the Queen is away for her summer holidays - and so are the rest of the family.
The rooms they open are ones that are used many times when family are in working mode not just the monarch.
They could turn BP into a museum and simply move everything elsewhere.
Charles has actually suggested that one way to stop the whinging from the public would be for the monarch to NOT sign over the income of the Crown Estate - which happens at the start of each new reign. He will do it when the time comes but he has suggested that in the past.
He wants a smaller working royal family but no reduction in the Sovereign Grant which funds the official work of the royal family - something doesn't add up.
2. Working royals - how many and what are they doing? Princess Alexander and Duke of Kent's retirement ? Part time royals and how to deal with the Montecito royals . Personally I feel that will have Harry back within 3 years. I do not see a scenario where they bring on Beatrice and Eugenie and not have Harry ? Too much bile for Charles to swallow. So then it will be how to work with Harry and Meghan's requests/ demands. Although Sophie appears keen to take on more work, Edward appears very reluctant so Charles is going to have to mend some bridges.
I can see the Kent's retiring due to health reasons but for no other reason. The Duke of Kent was asked about retirement some years ago and he replied he said he couldn't retire until The Queen did.
I don't see any more royals in William's generation other than himself and Catherine. Harry has made his bed, Beatrice and Eugenie were told a decade or so back they weren't going to be wanted or needed and so have built careers for themselves. If the York girls, who were raised to work for the royal family and have been HRHs since birth aren't wanted or needed then I doubt that Louise will take on a title she has never had to fill a need that others have been told isn't there. What a way to split the family.
Edward has been the third/fourth hardest working royal for the past decade or so and has done more this year than anyone other than William. He is far from reluctant. Once he gave up his job, in 2001 he has taken to royal duties competently. Charles doesn't need to build bridges with Edward.
The one Charles had always had an issue with is Andrew, even when he was the third/fourth hardest worker Charles preferred to hardly see him and once referred to his daughters as 'twits'. That is the bridge that has no hope of being repaired, sadly as Charles would do well to have the support of all his family, when the time comes.
3. Andrew - I expect that before July we will have word that he is talking to the FBI and that there is progress been made. It is an open wound and needs to be taken care of now.
Andrew will talk to the FBI when they get organised and send agents to the UK to interview him in the offices of his lawyers and under the UK's PACE rules. That is the standard approach when one law enforcement organisation wants to interview a witness in another country.
If the FBI want to arrest him they need to issue an arrest warrant and be able to prove that the crime is also a crime in the UK and if not - no extradition.
4. Titles - They will need to agree on the formalizing of the agreements regarding the Wessex children and indeed all children not destined to be in direct line. So Beatrice and Eugenie, Kent, Gloucester might have their removed. Archie and Baby Sussex will never have theirs given. Louise and James' situation will just be ratified.
This could be easily done without stripping anyone. George V's LPs didn't strip UK royals of their titles if they no longer met the new criteria.
Given the allegations about race and this issue it won't be able to be dealt with until the next generation unfortunately without stripping people who have been HRH for 85+ years i.e. the Duke of Kent. What a nasty way to repay a lifetime of service and of giving up personal ambitions for the Dukes of Kent and Gloucester and Princess Alexandra.