Hmm… I wasn’t very impressed by how well Friends and Foes meshes into the game, so I’ll reserve judgement on this. Off-hand it sounds like a potentially interesting feature.
The Grand Tour thing strikes me as interesting but maybe not as an option, because in practice the vast majority of the Kings in this game would be continually on Grand Tours until the 1200-1300s. Most medieval Kingdoms did not have real capitals - rather the royal court would travel from royal estate to royal estate, eating out the stored food and forage in one place before moving on to the next. Often, it was the only effective way for the King to make use of the income from those estates and an effective way to tax his nobles.