It is sad. I think a few things get my goat up, and in honesty being diplomatic as I am / try to be, the OP is of course a product of his time and conditioning.
It's this wonderous shit on the back of Europe hard work, research with very limited means bar rider feedback, basic engineering, slow trial and error, and trying to carve out a humble business and do what's best in life in a post war period that got bought for namesake just to re-invent the wheel at a difficult moment (again) in Europe. It harsh, but it was sold to whoever wanted it and offered a suitable settlement.
I give a lot to Jan Hein, and fair enough to him too for taking business risks, pursuing them, etc. - but no. A big no. Re-inventing the wheel?
He may have bought trade rights, etc. and have developed a following, but the history can not and have not been bought, and it really comes across bad egg for anyone - including the OP - to try and ram this "dusted off" stuff down our throats like it was revolution.
Even on the French premium vintage site, there is mention the original catalogues are re-produced by "kind permission". I can only imagine what the French would do if there was no "kind permission" to help document historical fact in terms of their own industrial evolution.