Hey Bern,
you can connect a relay to ‘tool-enable’ (pin 15) and it will be controlled by the g-code.
But be aware that new Makita model will prevent to be turned on again remotely after being turned off - finally they implemented safety (router is prevented to start to run if power is plugged in), now you need a hardware hack to disable this safety measure and make it able to be switched by a relay again.
But this will not work with the big red hardware button on top of controller box (explained why here), this will work only with a hardware emergency stop button wired to pin 23 (estop) or with the virtual estop button on the upper corner Onefinity controller application display.
As for the rest, I adhere to alldaysammyj opinion