Jeff (Utopia) made some really neat custom hand guards for Monsters some years ago, he probably still has at least one pair? Definitely worth asking him, as they won't be expensive and they work very well. Easy to take on and off too, with no mods to the bike.
I'm having a joy this winter with new heated socks, long johns and vest.
Lowest I've been is plus 3 and briefly a bit lower, but in absolute comfort.
I'll try and find links to the ones I bought a bit later.
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