Finally got around to doing this, I used one of the red/white wires running to the ignition fuse, and it worked. Bike won't start if the remote isn't close, and it sets off the alarm as well.
The anti-hijack works as well, it'll sound the alarm & then kill the motor. Hopefully I don't ever need to use that function.
So far I'm really pleased with the Scorpio SRX900 alarm. The big remote holds a charge for at least a week, even when I'm riding every day. The charging plug is a stupid shape, but it works. The key ring deal is flimsy, but I stuck a little velcro to the key & the back of the remote & just stick them together, seems pretty streamlined.