I’ve looked at these before actually… well rings constructed like these… and it’s a serious pain to get at the chip. Not impossible, but risk of failure and destroying the chip in the process is pretty high. I’ve tried to get at the chips embedded in these rings a few times… ring bits and a dead chip are all that’s left of those attempts.
If I’m not mistaken, Bankwest has a “sticker” kind of thing that is contactless only… conversion is much more likely with that.
I tried a similar style ring but with 125kHz ceramic ring; I managed to get the chip out, and it visually looked okay, I broke the antenna coil in the process.
The hardest part of it, was locating where the chip was, so I didn’t break it whilst trying to open it up
seeing as amal offers custom chips via your card, it’s doable. but I don’t think you will be able to have a plain band ring (I’m not too sure how the wiring works tho), you may need to put it in a compartment at the top (think class rings in America)
So I don’t know if he’s accepting work right now, and I have no idea on price, but I have a friend who makes gorgeous rings and has done nfc rings before. I’ll link his page when I can if you’re interested. You’d still need to swap antennas probably