Well, I finally did it.. the wiring is ugly and possibly dangerous but, I have MG and Cannon on push buttons.
I programmed 2 mixes in the radio on switch "D" that allow me to fire MG & Cannon from the 3-way switch.. then I simply connected the 2 button switches to the appropriate 'closed' tabs on it, acting as jumpers.
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Tiger I - Panzer II - Panzer III - Panzer IV - Chi Nu Kai - Panther G - KV-1b 756(r)
M4A3(76) Sherman - T-34/85 - M3 Grant - SECRET PROJECT