I co-stream with a partner of mine, and currently we use Reactive because it allows us to have two separately animated avatars. Is there any way to rig this thing so if I am on my friend's stream, that they can have my avatar?

It's voice reactive, so theoretically, you could do something like stream a HONK window with your avatar via discord or zoom and include the greenscreen, and they capture that themselves in OBS and key it out on their end?