Well the 'E' model bikes get by without a fan at all, so 'essential', probably not. I don't know if people who've toured on them have fitted aftermarket ones or not.
In your shoes I would probably keep the fan and not bother with the kicker though - IIRC you're travelling with Mrs FMF on a pair of bikes? Pretty unlikely that both batteries would die simultaneously, so woulda set of jump leads be a simpler solution? Plus it can't be that hard to bump a light bike like the CCM.
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