Pulley-mounted crank trigger w/stock Magnum EFI - trigger notches?

Let me set the scene for you:

I have a 1989 roller-cam LA 360 with Magnum heads on it; currently set up with a carb. It is a runner/DD, and I'd like to EFI it on the cheap; hence, stock Magnum EFI.

Obviously, sticking on a beer keg intake (or the P4510016 if I'm ridiculously lucky) won't be a problem. But that's not the issue.

Problem is, as an externally-balanced LA 360 bolted to a 904 transmission, I have no crankshaft position sensor notch in the transmission (not a problem), the external balancing means I'm more or less stuck with my existing B&M 10239 flexplate (problem), and the early TBI LA block does not have a mounting pad for the stock Magnum CPS cast into it ("oh shiyte" problem).

With this in mind, it just seems sensible to follow the rest of the aftermarket and weld on a custom crank trigger on my pulley.

However, everything I've seen to-date in regards to crank pulley triggers have been for use with Megasquirt and other aftermarket EFI systems - 36 tooth, missing-notch trigger wheels. High resolution, but delivering a different type of signal than the simple 5-volt on/off sync designed for the factory EFI.

Now, if I were to design an 8-notch ring (designing and laser cutting it is not an issue) for my pulley, mimicking the Mopar flexplate, and run with a suitable 5V sensor, should I be reasonably right in assuming this would provide the Magnum PCM the same exact signal it would otherwise receive from the pulse ring on the stock Magnum flexplate?

-Kurt