Hierarchical b-bones question

So I have a character's tail that I thought would be a good chance to use a b-bone, which worked fine since it's effectively just a bendy tube. However, this particular character's tail *also* has ornamentation hanging off of it that I wanted to be able to control, both for the sake of matching the direction of gravity, but also to have it sway back and forth a little while animating.

However, my problem is that I can't figure out how to relate the jewelry b-bone controls to either the DEF tail spline or the control tail spline handles--if I parent the jewelry controls (or use the Child Of bone constraint) to relate the jewelry handles to the DEF spline curve, it only inherits rotation if I rotate the DEF bone itself, not the handles that control the curve. But if I parent the jewelry control handles to, say, the tail control handles, that's not going to inherit the location properly.

This was all just experimental for me, so if it ends up being a wash (or possible, but super tedious to implement), at least I learned something and I'll just go use a chain of normal bones instead. But if anyone knows how to set this up so that the jewelry bones inherit the interpolated rotation and position of the tail spline, I would very much appreciate learning how.

Tagging @waylow in case he has any ideas.

Thanks for your time!