Different approach would be using the T.A.R.G.E.T. software:
I'm using the Right fuel control switch for Master ARM and programmed the button to the next keybindings:
Master switch ARM: LShift + M
Maste switch SAVE: LCtrl + M
In the T.A.R.G.E.T. software:
//Engine Fuel Flow Right
MapKey(&Throttle, EFRNORM, PULSE+L_SHIFT+'m');
MapKey(&Throttle, EFROVER, PULSE+L_CTL+'m');
The EAC switch should work the same.