Ive gotta confess...ive got heated grips on all my bikes but, ive got an excuse....severe nerve damage to my right wrist means that when it gets cold response to my right hand slows down....goes numb faster than my left hand...more so to my thumb and first 2 fingers...(median nerve severed...) ulna nerve graised...
My fingers freeze at a fairly uniform rate - about halfway to work on a chilly morning I will succumb one day I'm sure
Wheel Decals and spangly bike pijamas like @Robarano (I’ve not seen then in real life, they might be quite fetching... )