Wish that worked, I looked it up and was about to try it but changing regions means you're no longer able to use your NNID, so no eShop or online battles.
Check stores, maybe even make a group for it and have your friends check stores near them. Especially if you know of any stores that don't stick to release dates with other games. There's an electronics store in a mall near me that seems to have a lot of games early, and they started stocking it yesterday evening (a classmate said he had checked in the early afternoon and they didn't have it yet).
You'll also be able to use that info in the future, since I knew to check there since I had gotten SSB4 early from them.
The two release dates are sure to trip up some retailers, though, so I think you just generally have a better chance with Sun & Moon.