What about having a local genius audio equipment technician do a modification to your HUI's to make the suckers work? Why even bother with Mackie? I'm in LA, and I can think of a few guys off the top of my head who could probably dream up something in a matter of minutes...I'm not much of an electrical engineer (although I did completely dissassemble and reassemble a HUI once), but it seems to me that the circuit which "senses" your fingers can't be all that complicated.
Let me know if you'd like a referral for a good tech in the LA area...
