(I couldn't find a better place to put this)

How would I use the village transformer with the #gen command? I want to generate a VillageInn in a desert village, but it always comes up like in a plains village.

I don't think that's possible. You can always do a manual adjustment, but the transformer uses village metadata - which doesn't exist anymore at the time where you /#gen the structure.

When you only want to test your feature, you may generate a dessert flat world and search for nearby villages.
Maybe that could help you to figure out if your building spawns with the desired blocks.