Sinewave Revolution Converter?

The thing to understand here is that Schmidt prongs are a fancy version of a 4.8mm quick disconnect, which you can just buy generic crimp-on versions of the male and female sides of. So you would give the wire off the Sinewave standard Schmidt connectors, and then you’d make a little stubby wire to live on the SP hub that has its proprietary plug on one end and the male version of the 4.8mm on the other, so in other words it takes the Schmidt connectors coming off the Sinewave wire. Just use standard generator wire, which is basically 22ga twin core speaker wire. You of course need to figure out how to do this in a way that gets you to the wire length you need/want for each bike. (Note: I’ve seen slight modification needed to pair generic 4.8mm male quick disconnects into Schmidt female ones, but I’ve also put the generic ones on Schmidt hubs without issue. Basically you can make it work).