In terms of feedback/suggestions, I highly recommend using some sort of soft rubber (or material) to minimize the damage or scratches that could happen onto an artisan stem.
I collect artisans myself and I would be afraid to use something that's too hard that might potential scratch my keycap.
The rotating mechanism sounds very interesting but I wonder if too many rotational position possibilities will make it hard to match if you have a lot of artisans?
Other than that, this is dope. I'm definitely down to get some.
Any pricing expectations?