RAMBo 1.0d bltouch wiring help

Hey folks, I have an old, stock 12v Makergear M2 with a RAMBo 1.0d. The thing KEEPS ON TRUCKIN

Last night I updated the firmware to 2.0.9.1 ... here is a reference in case anyone else is looking:
[github.com]

Today I have a new bltouch coming in and Im all excited about it! The one thing that is tripping me up is where to wire the PWM connector. I can find references to some later model RAMBo boards that say to wire to the "MOTOR EXT" section... but alas my board (1.0d) does not have pins in that area: [reprap.org]
I could soldier some pins in I guess, but even then Im not sure which pins to use there. I'd rather not soldier the headers on here if I have a choice.

Are there any other pins I can use?

The "EXT-2" section on my board is populated with pins.
I have free E1 motor pins.
Also X-MAX Y-MAX and Z-MAX.

I was hoping to leave the Z-MIN connected to my endstop and wire up the bltouch separately... that way I can fall back easily if I need to.
The hardware/board side of tinkering is my weak spot. Can anyone help guide me to a solution?

Thanks!

I _think_ this might be my solution!
[3dprintboard.com]

Thoughts on any other approaches?

Its waaaaaay to late to post instructions and pics... but I got it working!
[github.com]

Sheesh this is awesome!

For anyone stumbling on this, I wrote up notes here:
[github.com]