One of the issues with modern electronic stuff.-----Nobody want to fix / support these items or make after market replacements !!------Old equipment that needs a bit of attention now and then is sometimes better.
I dont know if this is a viable solution but what about a DIY ecm. I use a "megasquirt" on my 71 truck. Right now it's a 96 454 fuel injected motor. It's a cheap version of what they use in race cars. They can be configured to run just about anything and they do canbus too. That is how I run my tranny.