something that was suggested for a long time
I think that's because blinded bearer certificates are quite complicated to understand. I read about it a few times, and I read your OP, but it's still unclear how it would work exactly.
Can you start by creating a live working version on testnet, before going for real Bitcoin? My guess is you'll have much more users testing your service when they don't risk real funds.
Point No 1 Op please make sure to edit your post and make it worth reading as its very hard to find what is ongoing in the particular section of the topic.
Agreed. If you can't present how it works in such a way that the reader quickly understands it, he'll move on to another service.