I'm not disagreeing with you, and I do believe Charles would have absolutely done this, and probably more.
If H&M hadn't thrown grenades into the RF. If they had stepped back quietly, just saying they no longer wanted to work as Senior Royals, but did so amicably. Not done Oprah, Finding Freedom, The Cut, Variety, The Me You Can't See, Endgame, Archetypes, Spare etc. Then Charles would probably have bought them a property wherever they wanted, they could have kept Frogmore, and probably got another UK property.
They crossed a line attacking Camilla and Catherine - Charles & William could probably have gotten over some personal, private family fall outs and arguments, but the public attacks on their wives was something I don't think (especially William) will ever be forgiven.