Checked switch and HAT function, created heat shrink labels for wires. Used Tosten's wiring diagram to find leads for eight switches and two common.
Debating with myself whether to use the common for ground, in which case the switch leads would need a pull-up resister to 12 volts presenting a continuous high input to the digital inputs. Then use the common to ground to change state.
Conversely if the common was at 12 volts the digital inputs would be go to a high state with a switch closure. The question to answer is what the microphone switch will require. The HAT switches could be treated differently than the other four. Will look at some bench testing.