So I was able to loosed the 3 bolts that hold the joystick bracket. Once I realized the bolts when through the fender and the nuts could be accessed from the wheel wells, it went pretty quick.
I was then able to remove the cover panel, but alas, there is no power connector to tab into. These are the only 2 connectors there (yellow arrows):
Closeup on the one that runs up to the joystick handle via the grey wire. It is pretty clear that the 3 conductor plug is for the 3rd function, and the 2 conductor one is for the front switch (presumably for disconnecting a front global carrier attachment with the optional solenoid).
And here's the joystick handle showing the 3rd function switch and front switch not currently being used.
So I went to plan B, and used the additional open station harness that connect to the main harness and utilized a power source on the inside left fender. I also picked up ground here as well (12V and ground wires shown with yellow arrows).
Here's a page from the install manual showing the main harness.
And a poor picture showing the tractor power supply plug that is supposed to be down by the shift lever.