I managed to make plutohome find my two Zaptel cards, but it wasn't fun
Basically, I insmod'd the /lib/modules/2.6.13-2-vanilla-pluto-1-686/misc/zaptel.ko module, and then the wcfxo module. Now I've got both modules in the kernel, and dmesg show my two cards. It looks like all the modules are there, for the 4 port cards as well.
Next up, how to get AMP not to kill my zap* configs.