My other favourite way to bodge a working solution is adapt an e-bike.
The rear end of an e-bike often comes with >1kW, and a brake for holding the kite from running without using power. (not that a yo-yo would benefit from that Wink Wink)
Kids E-dirt-bikes can be got at around 3kW
Would be a shame to waste all of the front and top parts…
Staying e-bike standards Using a fat-bike hub, you could extend it’s walls with drum sideplates instead of spokes - Or alternatively just make/source a wide rim