IUP does complicate this a bit but I’ve done it in store and it’s a hassle. Last time I did it, I had to talk to like 4 different employees because the honestly get so confused with that program, it’s weird. They may have a better handle on now last time I do this was 3 years ago.
The program takes about 10 minutes to reset after you return or cancel an order so it’s not the easiest to do an exchange in store. I think you’ll be fine, they may just have you wait a bit before they redo the loan.