This is actually quite interesting, and it might work !
The only issue by kiting in the winther, is always the hands
I am a true Viking, so can usually kite in freezing conditions sometimes even without gloves - but only by means of practice and some special techniques you learn during 34 years of surfing in winther conditions.
But still - the by far biggest issue is not the suit - there are 6mm wetsuits and drysuits, so keeping your core warm even in -5° (23 F) is no biggie.
But keeping the hands warm is ALWAYS an issue - especially if you are far out/away and can not make a stop.
As you close your circulation of blood when holding the bar.
Without gloves you sometimes blow your warm breath on your fingers, or maybe even "suck" on them, to keep them warm.
So the idea of using this really hot energy you got inside your warm suit, to the gloves, is quite fascinating
We have just been out in a snowstorm in sub freezing temps today with 5m2 kites and good waves and a big upwind leg, so can really relate to this issue, that a "backup" warmth plan could be awesome