I think if I was Charles or William I would do as a PP suggested: wrap up taking away the titles in a "modernising the Royal Family & giving the British public better value for money" wrapper.
So the WRF slimmed down, titles removed, including from Beatrice and Eugenie (2 birds with one stone, ha ha!), open more properties to the public, with proceeds going to charity, keep all the pomp and ceremony and soft diplomacy, and keep "showing up and doing good" - which is absolutely what the WRF have been doing in recent years.
That would deal with AMW's daughters, HAM and the Hamlets and would be great PR. Alas I don't think Charles has the guts to do it but William might.
They are still playing a blinder, with no clap backs, grey rock, other than short, factual statements. They know how to play the long game, good for them.