It seems Fabric version got a lot of changes since then. Is it possible for you to port these change over to Forge?

Yep, working on it, it's just more fun to add new stuff to fabric instead so I'm going back and forth porting to forge and adding stuff.

If possible, can you focus on 1.21 Neoforge? I'm moving away from 1.20.1 soon.

I will probably try to use the Fabric version with Connector, hope it works.

Yes, the 1.21.1 is going on NeoForge only. Haven't begun on that yet though.