I considered one of these shifters but the goldwing I sat on that had one really restricted the fore and aft movement of my boot.
Kind of pinned between the shifter pads- seemed dangerous- might hook your boot if you have to get off the bike in a hurry.
Does this particular shifter give you plenty of movement room for your boot?
Perhaps the one I tried was shorter than this one..

I might try the Kuryakyn peg lowering kit with the adjustment for 2 inches down and a little forward so I can get the toe of my boot under the shifter for upshifts.