yes, sounds like a good plan.Thanks all for further advice, I'm pretty OK generally with bike mechanics, but like many new to all this, the electronics seem more complicated than you expect - so I am very tempted to go with someone like Whoosh to begin with. I can see that the battery is by far the most expensive part of the package, so maybe I could experiment with upgrading other parts later.
These motors are good because you can exchange controller, display, sensors and battery to something else if you want. If something brakes or you just want to try (need) something else. Kinda like a standard for these parts. Not everything but many combinations is there.