Glen I just read about using COP with the Dizzy only. I understand your decision. I would like to highlight something. I would suggest installing a hall sensors on the crank, why you ask? With heavy value springs and larger valves etc you will get belt flex it can move timing around and with more harmonic giving a noisy signal to your ecu which the tuner will have to give more noise filtering. You still use the dizzy for your 720 Degree signal and hall sensor for your 360 degree.
This is Dizzy only to the ECU above pic at 1500rpm.

The white line is the Hall Sensor, Blue line Dizzy at 1500rpm. A far clearer signal for your ecu.
Better to be on the safe side of your build. Hope this helps.