Actually not even that OT!
One of the admins was putting an LS into his P38, and piggybacking the LS ECU on the GEMS, so the rest of the car wouldn't freak out. I was trying to convince him the car barely needed any feedback from the ECU, and it would be trivial to just connect those wires to the LS ECU. Not sure anymore about the exact interactions, but I remember telling him to get his head out of his behind, and then I was suddenly banned
We've since proven with @Escape's MS that it is indeed perfectly doable (even though it isn't running in the current car yet, it has worked in a different car).
And also why I'm convinced integrating something like the Haltech shouldn't be too difficult. Just need something that meets all of my requirements, and isn't going to be worse than what I have now.