hmm..... with both of those being on the T-side, not really able to patch in that kind of a function. might be able to abuse the existing calibration items to do it though.

alternatively.... the a/c temp sensor(only ever used on f-body calibrations) is on the e-side and is also already setup with a pullup to 5V, and would be otherwise unused for your application. most of the existing code concerning it could be kept as-is. you have a couple outputs you could choose from on the e-side as well, depending on what equipment you plan to keep on the engine. E-side controls:

all 3 EGR solenoids
a/c clutch
CCP
AIR pump
and an unused circuit on quad-driver U34, should control pin B5.