So… Update. I ended up finding a way to get what I was looking for!
I used @Julien 's code from his CNCjs handwheel pendant (detailed howto for nerds) post, with modifying the code a little and hooking up wires to another GPIO pin. I used a 12V power supply for the switch, which went to a relay to open/close the circuit going to the raspberry pi GPIO! 
Exactly what I was looking for!!
Now I just need to figure out why the code isn’t recognizing the initialize button on the side of my pendant after the code mod… 
