I have aftermarket "HotGrip" heated grips. I currently need to replace them (due to age/wear) and would like to add Salamander ends. I am assuming installation will require cutting ends of grips open. Do you forsee an issue with these particular grips (they require epoxy onto handle bar and throttle sleeve)?

You can cut a hole in the ends of Hot GripsTM grip heaters no problem.  Just don't cut off the end.  Generally, any heated grip with an inboard power feed (that doesn't feed out the end of the handlebar) is fine with our products.

Hot GripsTM have been available for several years with open ends, and those are ideal for our products.