As to your original question VEST! You need to keep your core warm. That encourages the body to pump warm blood to the extremities rather than shutting them down, heating your hands or feet is pointless if your core is cold.
Make sure anywhere big pipes go close to the skin is covered well. Wrists, neck. Wearing a balaclava makes a HUGE difference to all over body warmth.
(Took me from cold & shivering to pleasantly warm on a 32 degree day).
By the way, with the proper controllers on a vest a GS can EASILY support heated grips & the 60w of the vest at decent speeds (turn them off at idle). I have run both on mine. You need a healthy charging system & battery obviously & one of the newer Shindengen RR's helps keep the volts up especially at low RPM (I have seen this first hand).

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