I would try eithr 2 part epoxy or buy grip glue from performance engineering or dennis kirk. The last thing you want is to have your grip pull off on a hard turn. It also helps to scuff up the bar with scotchbrite or sandpaper for better adhesion. goodluck
Paul are the heating elements not in the grip part ? If you don't like spray foam use a solid foam, hell use tissue paper or what ever , anything to fill up the dead air space in your handle bars and transpere the heat to your hands where it is needed. Speaking of hand warmers I was also told that if you stuck a piece if sticky foam tape on the back of your thumb warmer it would help keep a lot more heat on you thumb.
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