My completely ignorant reply would be that *if* the OS recognizes the bridge chipset as being the same/similar enough to one in a Cardbus-capable Powerbook (Which would be, what, the 3400 at minimum?) than it might well work, unless the Apple driver specifically looks for other Powerbook-specific attributes before loading it. Otherwise you're probably out of luck. (There are not very many makers of Cardbus bridges, I believe the one in the 3400/Kanga was made by Texas Instruments. If you're still looking for the adapter I'd probably try to match the bridge in a Powerbook as closely as possible.)

The only PCMCIA slot adapter I have any experience with is an ISA-to-PCMCIA (no Cardbus) model. Linux worked basically out of the box with that using the appropriate bridge chip driver, although I had to modify the modules config in Debian to load it. (It's not on the list of drivers which probe automatically.) With said bridge I can actually seamlessly join my 1997 vintage Dolch lunchbox to WPA1 encrypted networks via a WaveLan Silver card pulled from a dead gray AirPort. Yay! ;^b

Edit:

http://people.wallawalla.edu/~Rob.Frohne/Cardbus/Cardbus.html

The 3400 used a TI PCI 1130, apparently.