There is one more option I know of if you care to build it yourself. You will need decent soldering skills, but it isn't difficult.
MegaSquirt. It has come a long way over the years, and offers kits to do just about anything you want. The already built units are more money..read expensive.

The DIY kits are reasonable.

I built an MS2 about 8 or 9 years ago for an LT1 project I had. It was a lot of tedious soldering, but in the end it completely replaced the LT1 PCM and the OptiSpark distributor.
That distributor was what I was wanting getting rid of, and used a crank pulley mounted trigger wheel.

Your coil over plug system would use your existing CKP signal and keep your sequential injector fire as well.

https://www.diyautotune.com/shop/meg.../megasquirt-3/

HTH

James