The latest version of DaynaPORT, from what I can find, is 7.5.3. This was made in 1993, so there's no chance it has PowerPC code. Plus, all early PowerPC Macs and most later PowerPC Macs, with just a few exceptions, had ethernet ports, so I seriously doubt there were ever PowerPC drivers for it. On the other hand, I'd be very interested to hear if someone gives it a try.

(I mention this because the Asante and the DaynaPort were both made to solve the ethernet problem for the same machines - very early Macs).

A 3Com PCMCIA card should be easy to find on eBay. The drivers are here:

http://www.floodgap.com/retrotech/mac/enet3c589/