These look great, Fishball!
I wonder if the '83 650 electrical system would handle the heated grips? Sound very toasty, but I'm leary of overtaxing the quirky charging system... Now that it's getting down into the 30s, my fingers turn white within 5 miles of riding!

Yes it will!

2 weeks ago I have finished installing Symtec heated grips on my '83 650 (the year with lower alternator output) and so far I haven't had a problem.
I do put it on battery tender once every 1-2 weeks, but I checked a few times after my commute, and the battery was at 12.8V.
I plan on doing a write up, but so far didn't get to it.