I found a reference in some conversion sockets between CF and PCMCIA which suggest that the master/slave designation of each connector is specified by /CSEL (pin 39 on CF). Low=Master, High=Slave.
Can anyone verify this information? I see on the zaurus that this pin is left disconnected, which may put it in a cable select state. If this is true, I should be able to wire up a second port, and connect pin 39 to either ground or +V. Seems way too easy, but then again that's what I thought about the external battery packs I'm testing, and they're doing fine... so maybe I'll get lucky again.