So could you make a 1.20?1 version of all your bundles? It is still one of the more popular versions to mod, and so you'll get even more downloads on the bundles that way.

Unfortunately that's not planned. The bundle generating code is specific with combined Fabric, Forge and NeoForge. Since 1.20.1 doesn't have Neo, it takes a lot of custom code to get it to work.

It'll be kept up to date for all future versions though :)