I have read about this before. If it were my car, I think I would wire up an additional switch to over-ride the compressor when desired.
I understand that the de-humidifying feature is the main reason to run the compressor when defrost is selected.
But the majority of my cars have not had A/C, and they defrost just fine by directing air flow and heat (if needed). Living on the coasts where it's damp and rainy, maybe you would appreciate the de-humidifying effect more.
View my fuel log 2015 Micra S manual: 5.0 L/100 km ... 56.5 mpg (Imp) ... 20.0 km/L ... 47.0 mpg (US) ...