I figured I should update this thread with my current status and a small reveiw ofthe card:
The F5D6060 (aka FSD6060) works fine in OZ 3.3.6-pre1, but not the SharpROM. I think the OZ roms use the hostap_cs module and SharpROM uses something different. In any case, I'm sufficienly happy with OZ, so I'm sticking with it.
For those who wonder how well the F5D6060 fits in the SL-5600, it's works pretty well. The headphone port is sufficiently exposed, but the stylus channel is slightly blocked. I can get the stylus out if I bend it slightly when removing it. What might work better would be to trim some of the plastic from the CF card case with a Dremel just to give that extra needed millimeter or so.
Also interesting is that be back panel on the CF card can be easily removed/replaced revealing the etched circuit-board antenna patch. It would appear that there is a notch where you could modify the card to install an external antenna.