@ReluctantGM
wizard and cleric are going to be very close to their standard classic fantasy layouts I suspect. Maybe an extra gift here and there. The diviner gets to keep an extra d100 roll, for example.
advantage is a reroll. That is covered by luck points, which, in and of themselves, map very well to inspiration.
in my view, I think bonus actions map closely to special effects. Many of those could be just made into a custom special effect.
Action points themselves are different, and sort of map oddly. You gotta think that a 5e character has a move and a standard and often a bonus action.
hit me up sometime with the classes you are looking at. 5e is actually not bad at all to convert