Pretty much exactly what I was thinking AC.
If the vane and fan use closed loop, that would certainly complicate things, although perhaps the vent just registers open or closed.
Possibly the frost detector probably could be fooled with an appropriate resistance. May be irrelevant as the unit would be for heating only. The IDU heat sensor would preferably be securely insulated on the HX water output line or in a thermo-well.
So next, shopping for an appropriate unit, and finding time.
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