New rubbers seem like low hanging fruit, might as well update them when you're doing a full swap. New t-nuts are a good call... though on past swaps I've used the old ones if the teeth still bite and don't look gnarled, still can't hurt to put fresh ones in. The game is too new and LED'd so you don't need to proactively swap lights.
I'm trying to think of other high wear parts but the game just can't have that many plays it to warrant looking at flippers or pop's.
I also can't think of any areas where you may drop a piece of mylar during the swap because it's easier to get to. Beyond the ball dropping into the in lanes does it land anywhere else repetitively? It's been a while since I played an AIQ, I guess it does off the plunge but that is more of a skip than a drop. Maybe take a good close look at your existing playfield for areas that look a little more worn than others?
If you're adding Cliffy's, now is the time for sure, way easier on a bare playfield. Thinking of other mods that you may want to deal with now, there was a machined Doctor Stranger spinner people liked when I owned one, that's gotta be easier to deal with now.