I found a company that sells a Payment Ring. Upon a quick look, it seems to be like Purewrist. You have a prepaid account, and fund it (via bank, PayPal, Venmo, etc… Also, the ring expires (based on photo from their app).
I didn’t see it mentioned in the Forums yet, so I thought I’d mention it. I’m currently headed out to dinner, but I might do some more research later and share my findings. Not sure if a Conversion Service would be possible, but it might be better to just go with the Walletmor (unless this ring has a longer expiration date), not sure yet.