I think it would be reasonable to make Arcane Circle turn into Plentiful Harvest. I also think that it would be reasonable to turn the likes of something like Harpe into Communio. I don't think that Void/Cross Reaping should automatically turn into Communio, simply because it's on you as the player to get the button presses right. Communio's cast time is fine as well.

Context-specific button presses make a lot of sense on Reaper because you have a distinctly separate 'form' with certain actions that are only usable in that form. It would be like creating a shapeshifter job and forcing the player to keybind even actions that they weren't allowed to use outside of a particular form.