Yep! Things are pretty slow right now but the shop is still open. I just posted in it a few minutes ago so it should be on the first page of the museum shop. Feel free to post about an update.
That's fine! It's 10 TBT per update btw, so if you change all the villagers at once it will only cost 10 TBT. But if you come back later with a new update it'll be 10 TBT again.