@Gilloo
Persuaded with what?
Seriously,
If 16-bit pcmcia usb-cards really do exist and are for sale, and you are willing to write such a driver, maybe a small bounty could be set up. If there are enough users out there, who are interested (and there are still a lot of a600/a1200 users out there), it must be possible.
I am the lucky owner of a subway and deneb card myself, so for me it doesn't matter, but I'm sure there are still enough users who don't have a subway.