@ stefan
I read through your posting and one thing caught my attention:
you said you trained with X amounts of people for Jun Fan Jeet Kune Do and Jeet Kune Do Concepts knowledge, but you ve never been an instructor under any of them.
Have you been promoted to instructor level after attaining sufficient skill and knowledge in these interpretations and declined it because you only wanted to concentrate 100% on TWJKD and not "stain your lineage" or have you actually never been on an instructor level with them in the first place?
regards
Wilfried