Get one of these http://www.sigmasport.co.uk/item/Profile-Design/Universal-Computer-Mount-25mm/4X then stick a garmin out front mount on it.
You're only the 3rd person to suggest something I've been using for the past 3 years.. :P
Ha
But if you mount the adaptor at the end of the extension and then bar tape over it it'll be out infringe of your hands.
@hippy started
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Get one of these
http://www.sigmasport.co.uk/item/Profile-Design/Universal-Computer-Mount-25mm/4X
then stick a garmin out front mount on it.