A while ago, I installed internal grip heaters on my 2001 C10. Found a simpler (cheaper) way for the 2000 Suzuki SV650S, but it's probably equally applicable to a Concours.
I ordered a set of these for my Connie. Should arrive in the next couple days, just going to wire them up to a relay that draws from the battery and actuates from ignition (maybe headlamp wire).