It's an excellent idea and one I adopted a decade or more ago when I saw someone with a helmet hook in Morocco.
Except his (and mine) are highly inexpensive carabiner hooks which cost a couple of pounds. By securing the carabiner with a cable tie against the handguards you can swing the hook up and out of the way when not being used so it doesn't catch on anything.
I often use an open face helmet in Morocco which fall off mirrors very easily.
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"For sheer delight there is nothing like altitude; it gives one the thrill of adventure
and enlarges the world in which you live," Irving Mather (1892-1966)
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