The King knows his reign will be shor ... will he really want his legacy to be AMW and Hopeless, weak, feckless,disloyal Harry?
I'm not sure it matters what he wants his legacy to be, @DaisyDooley; among those who forget the undoubted good he did via the Prince's Trust (now the Kings Trust, though still run by others) that's what it will most likely be
It's well understood he's a "caretaker", and if I was a monarchist I'd worry about the consequences if he uses his frequently shown poor judgment to indulge himself with some fairytale about Harry being around for his last days
Remember too that, apart from the fact Harry would probably blab, we can't actually know whether they're in touch behind the scenes, and while W&K may or may not approve (another thing we can't know) I certainly wouldn't expect Charles to let what the little people think stop him
As for the idea of people being angry if he had Harry back ... initially perhaps they would, but a few leaks about his mental 'elf and a coordinated hatchet job on Meghan would soon have the more gullible insisting it was the right thing and that we should all move on