I wonder if a notarized power of attorney (to act on behalf of the registered owner of the motorcycle) along with a notarized statement from the registered owner giving the rider explicit permission to carry out the specified voyage (including general route description and dates of travel) would be sufficient.
My Canadian-plated motorcycle is registered in my wife's name (a leftover from long ago, when I was not resident in Canada). I've never had any inquiries from border guards or the various insurers in different countries because the bike is not registered in my name. This could be, perhaps, because my wife and I have the same last name, but it does suggest that neither the border guards or the insurance clerks pay a whole lot of attention to what's written on the ownership document.
My experience has been that they just want to see that you possess the ownership (registration) document, and they then check in their computer systems to confirm that the motorcycle is not listed as being stolen.
Michael
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