You''re sort of getting close to the price of the DSM CAS adapter - and then just snag the sensor at a junkyard for $10.36-1 wheel $32.00
Weld 36-1 wheel to crank $100 - Going to have the wheel fully welded and balanced, tips from a racer that did the same thing and broke his wheel off once due to spot weld and broke the crank the second time due to balancing.
crank sensor $43
https://yoshifab.com/store/billet-redblock-dsm-cas-adapter.html
That is a powered sensor that makes very nice 'square' crank signals, and it has a cam signal as well. Which allows you to move to something other than wasted spark if you felt like it.
Of course, then you have to 'time' the intermediate shaft when you change the t-belt.