I had heated grips on my 2006 and running a wire from the starter solenoid to a relay (pole 30 to 87) onto the grips is really quite easy...then just trigger the relay (86-85) with a wire up front.
Anyway, the heated grips did a great job of keeping my palm and palm side of my fingers warm. Not so much on the top. I have a condition known as Raynauds which "causes some areas of your body — such as your fingers and toes — to feel numb and cold in response to cold temperatures or stress".
I won't put a set on my 2017. Instead, last fall I bought a pair of heated gloves. 7V batt Gerbing gloves on a closeout from Cabela's, $124 shipped, no wires. I rode all winter on my work commute (10 miles) and loved them. They heat up right away and have three settings. Combines with a good coat. pants, and a Freeze-Out neck sleeve, I tend to smile on most mornings.
Good luck OP