There exists a fairly large community developing implantable rfid chips and one of their biggest dreams is being able to use the chip for contactless payments.
The technology is definitely there: https://forum.dangerousthings.com/t/vivokey-apex-update/8850
I believe (and hope you agree) that bunq is THE bank to be the first to implement this. Being the bank of the free, this seems like a logical next step to me and as the technology already exists, the initial investment is minimal.
Curious to hear what you think!