Here is the pendant diagram, wired up to an RJ45 Screw Terminal connector (Available on Amazon for about 12 bucks)

I built my pendant with parts from an old cartop station, because they were free, but the buttons and switches could easily be purchased on Amazon or from an electronic shop.

This will save you about 2000 bucks from having to buy one from Access2Parts.

Photo of the wiring diagram:
https://ibb.co/2ktTjFX