Beta went half and half with a carburetor and oil addition via a pump. Not without problems, particularly with air in the oil feed lines. At least you could block off the oil fed and revert to pre-mix.
One thing you can say is that the Betas do run pretty well and at oil ratios around 1:100 on low engine load so emissions are improved over straight pre-mix. The oil side still seems to be the weak link.
I don't know if you could use an existing petrol injector to inject pre-mix as I imagine the oil affects the density and mist qualities of the fluid. Perhaps you might need something more like a diesel injector. That's another area of product development and cost.
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