I'm not convinced by the Eden article, it seems like pot stirring. I can't see a government that is facing the problems this one is thinking that Harry and Meghan of all people would increase their popularity and get them votes. I'm sure Harry has written, Charles wrote quite a lot of Prince of Wales, but I don't recall even Charles had much influence, far less will the 5 th in line to the throne. There is simply too much important stuff going on for anyone to do more than smile and nod at Harry's latest tantrum.
It isn't complicated for Harry to bring his family here, except in his paranoid mind. He has wanted IPP status ever since someone told them to remove that assumption from their original statement on Sussex Royal. I don't believe though that it is something they can be awarded because of the international nature of the rules governing it. They simply don't qualify as diplomatically important. His continuing campaign is about finances and status.
I can well believe that Charles and the courtiers want a solution to the never ending drama but I can't see Charles, or the men in grey suits, pushing to anything that William doesn't agree with or which undermines William and Catherine. The grey suits are focused on the survival of the monarchy and it's stupid to undermine your most popular members. Plus William and Charles are obviously getting on well these days.