I cant believe Im recomending this,but it sounds like your going to go out there regardless,so Id feel remiss if I didnt do some measure of saving you from yourself
Tiger Balm the hell out of it,I mean really have someone rub you down with it,it'll keep the shoulder warm wether you want it warm or not.
If you can find Dragon Balm,even better
In theory its only a dermal warmth,but it does seem to penetrate,kept my knees functional way longer then I deserved