100% my issue too.
Was thinking in a same manner to get a large band. Have a medium band and the buckle/G-hook is at 180 degrees from the watch and thus scraping my macbook. Dont think i can exchange it for a large..
Sadly the Apple Store in Sydney won’t let me exchange a size S green alpine loop to a size M and said I had to return the whole watch combo.If we are talking different style bands, then no, they won't do that. If we are talking the same band but a different size, I don't know. My assumption is that it's the same policy.
Which is ridiculous by the way. Apple stores should have a system where you can exchange the band that came with the watch for something else if you desire without having to do a return of the watch itself.
So now I’m without an ultra and I’ve been checking hourly for stock and it’s sold out everywhere 😡