If there's a rack supporting the bag (and I'm sure there is) I can't see that option being a problem. Check Ed's post #82809 Also, fresh tripe sells a mount that gives you, uh, another mount. http://www.freshtripe.co.uk/freshtripe/Handlebars,%20Headsets%20%26%20Stems.html
I hadn't seen those extended nut things, might give them a go, figure the extra bar should be fairly easy to remove...
@atk started
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If there's a rack supporting the bag (and I'm sure there is) I can't see that option being a problem. Check Ed's post #82809
Also, fresh tripe sells a mount that gives you, uh, another mount.
http://www.freshtripe.co.uk/freshtripe/Handlebars,%20Headsets%20%26%20Stems.html