RB250sxtask

I'm attempting an aem 24+1 trigger disc swap on my cas and it isn't going well. My cas is all pins and pressed bearings. Nothing like the bolt versions of the vg series cas. I have been reading and it appears as long as you can rig up some way of getting a signal to a sensor for cam or crank angle and duration you can make the rb ignition work. I've read that cam sensor setup on rb is unreliable, but was wondering if the jeep 4.0 flywheel crank sensor setup wouldn't be a sufficient setup. Why and why Not? It runs off of a flattened tooth on the flywheel. (Grinder and a drill) would be able to flatten a tooth for tdc and the sensor would be tapped into the back of the black to read the flywheel correct? Just a thought since this setup is very cheap and easy to come by. Any thoughts?