This appears to be the cantilever part they’re using (includes MR stylus), from Orbray / Namiki:
https://orbray.com/en/product/jewel/product/shop_diamond_microridge.html
Costs $2500 for 1 pc, but the price comes down quite a bit in quantity. This part is also exactly what the Koetsu diamond cantilevers look like under magnification. Koetsu must have specified a different stylus (their usual), but this looks like the cantilever part maker. Here’s my Coralstone circa 2018. It’s a lil sloppier of an attachment than my Blue Lace lol

Did you sell/trade the Innovation for the Master or buy the upgrade kit?
I don’t know anyone who did the upgrade. With secondary markets and dealer trade-ins, there’s no real price incentive to do an upgrade kit. I had an Innovation Wood and did a "sort of" trade in with my dealer for their demo Master. "Upgradeable" turntables can be a big selling point but they fall flat in practice.

