1) The maximum weight limit of the Kuat Transfer v2 is 40lbs/bike. Is your ebike, even with battery removed, less than that?
2) Ramps not made for this rack won't work. In particular, I own the 1UP ramp (and will gladly sell it, btw), and don't see how that would fit another brand's rack.
3) Ramps are good for 1 bike only anyway. Rolling up the second bike will have interference with the first bike due to close spacing and handlebars. It really sucks leaning the second bike to try to miss the first bike. Might as just lift the damn thing.
4) There is a bike rack, the MoTow, which has an available screw lift. You can load the bikes almost on the ground and then use a power drill to raise the platform. It's not cheap, though.