I'm sure your 650 isn't the first to have aftermarket rims added. Have you tried an internet search for maybe "speedo adapter" or something of that nature?
2006 V-Star 1100 Classic
Silverado windshield and passing lamps
OE Highway bar with custom mounting brackets
Kuryakyn Dually ISO Highways pegs
Barons Nasty Boy Slip-ons
Kuryakyn led headlight halo