Just in case someone stumbles upon this in the future.. I tapped my "brake light safety" wire into the black/red on the clutch position switch (the one up top of the clutch).

I might post a wire summary next weekend in case someone else wants to do something similar later on, this was not a lot of fun to get working but good documentation is crucial for future issues + this can all be reversed, which is also nice.

As far as a latching ground, decided to ground it entirely so if the push-button has powered up, the transponder info is transmitted continually to SKREEM. The passive RFID has to be triggered by the keyfob to set off that process. The factory alarm, locks, etc. are all still in play.