Can't fathom why you would want to, but with fairly straight forward design, some selonids and contact switches with a self centering lever you should be home. Forward to upshifts, back to down shifts. Not that it was asked about, but the same could be used for bars mounted shifted via a switch similar to our turn signal switch, but without the detent. Selonids would be similar to the ones used to lock/unlock car doors.
Can't see why this wouldn't do it, unless the forces are a lot higher than I think.
09 Vulcan 900 Custom - Traveller
09 FZ 6 - Lakota