It's a jerry-rig that negates the purpose of the oil pump to compensate for the added stress of the engine.
And the simplicity behind your mixing strategy is horrifying. 20% speed increase? I got that on my Puch with just a pipe. (30 mph to 36 mph) With kit's you're looking at closer to 75 to 100% and higher speed increases. By your math, you would end up with a 25:1 mix if your bike goes from 30 mph to 60 mph with the kit. (100% speed increase = 100% increase in oil, meaning 50:1 in the tank in addition to the oil injection) The only thing that would stop your rings from sticking in their grooves might be the fact you're fouling plugs every few miles.
Sorry rizz. The idea may have merit, but the complexity needed to correctly figure out the additional mix to compensate for the kit is not worth the hassle. Which is exactly why kitted bikes go premix.