Nope, although I am planning to do the same thing! It looks like it shouldn't be too much trouble to program some of the "drum" pads to send the proper sysex strings to the echoplex though. That's my plan anyway. Maybe even try to reduce the number of foot taps for some functions to one finger whap, if I can.
Ordered a Z2 from Harvey, still waiting, but has anyone already mentioned that there appears to be no Echoplexes being manufactured right now? I just put my name on the waiting-list-from-hell at Alto. They said manufacturing wouldn't rev back up until the fall. Has anyone else confirmed this?