Here's ANOTHER fiddling about with the pose scope attributes (I will do something else at some point, honest).

This one is definitely a lot more WIP, but it can be quite magical to watch happen.
Super simple setup that clamps the input capture weights gets the path of the capture regions container and then creates a pose scope attribute which it transfers back to the properly weighted mesh. I tried this with importing a mixamo fbx, and whilst a little rough it did allow interaction with existing skinning rig in about 1 minute!

In the hip file attached, you can see the results on said fbx (all the unselectable geometry nodes have the pose scope from capture hda in them.)

Anyway, any thoughts always welcome

*VERY* cool (it may be dirty, but …) this, slightly cleaned and user-friendlyfied, could be a bloodsucking-killer-feature!

Thanks!

Marc