You may have trouble finding a ECU configured to fire at the correct time from a car, being a 2-stroke and all, unless you run 2 injectors per cylinder. A car fires and injector every 180 crank revolution. It may work

I think maybe you would be better to use a ECU that picks up off an ignition pulse rather that crank angle sensor. You would have to use a fuel only computer as well, and let the faco NSR PGM run the spark.

If you want to go down this road, id be looking towards the jet ski aftermarket for bits, as all jet skis majority of skis are injected twin 2 strokes.

Its a interesting quest your embarking upon. But if drag racing teaches us anything, a carb engine will make the same peak power as an injected engine. Not as smooth from idle through to red line, nor as efficiant, but top end performance wont be real different.
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