Several things to consider here...I might be able to talk one of the SW's into letting me have the grips, so may get them, even if I don't put them on. I could always e-bay them. I've got an extended warranty, so could make them do this for the next 6 years if I wanted to. BUT, I really don't want the aggravation of having to do this several times. I have little or no confidence in the HD grips lasting, unless they redesign them soon. Also, I've been looking at the Iso Grips myself. I'd like to actually feel a pair though.
These heaters look like a better solution...the heat on the hands is a real plus. Mounting the switch on the right side, even upside down, wouldn't be a problem for me. Because of the mods I've made to the Legends switch, moving it is not really something I want to do.