My oops. I keep forgetting that your paired cylinders would be on the same up/down stroke.
If you stay with the 2 injector plan, the pick up coil for each pair, will be your best signal.
If you go to the 4 injector plan, (because the engine is a V) maybe you could use the differing time between pick up coils to determine #1?
ie; I keep thinking the engine fires at 180* increments. But with your V, it is different...
What is your firing order?
If 1,2,4,3, Maybe the degrees/time from 3 to 1 is distinctive?
Good deal on the throttle body. Do you know what size it is?
If not, what is the engine size and RPM range of a CRV?
Ride safe, Ted