Hi Peter,

It's great to hear from you!

I think your possible Beta strut top tab washer production is a good idea.
I'm using Beta rubber strut tops on mine, but with GAZ struts. The GAZ struts have the 'D' shaped threaded part, but uses a nyloc and a round washer.
We have Beta owners on here. At least two I can think of.

I had a run of S1 Beta wood gear lever knobs made not so long ago. Mainly for people on here, but some of them went into BetaBoyz stock.