I installed the "Bendix King/Honeywell General Aviation FMC" in my FSX & works OK.

I coupled it to the A/Pilot on the LearJet that has "NAV / GPS" selection button.

1. Is there a way to couple it to the A/Pilot on the Beech KingAir that has no NAV/GPS button?

2. Instead of dedicate this FMC to the "display-hide GPS button" to open the FMC,

how do you designate a new key to open it