It seems that the whole issue stems from the ‘Curve’ and/or the "Curve’ modifier
I may have stated that incorrectly - but it does have something to do with things that rely on the ‘Curve’ - in Local or Global space, IKD. I have tried about 6 or 7 different set-ups, different ways now, all with ‘Curves’, they all have failed…
BTW, are you working on a similar topic, or are you simply intrigued by those kind of problems? I am positively surprised that someone puts so much own effort into solving this for someone else.
Nope, just like a good challenge when it comes to rigging, off work till April 1rst so I got time to burn…LoL…After all, that’s what this forum is all about. Been using Blender for a lonnggg time.