I think the cheapest, best alternative is to have a Plan 'C'.....
For $2000 - I have considered placing a Dynon EFIS (
www.dynonavionics.com) in the panel (placarded for reference ONLY!)
It uses a battery backed up display, and Solid State Sensor based AI.... You could ignore the Pitot/Static capabilities, as they would not be certified to attach to your system....and symply have the AI for a Total Failure backup system only...
When the panel goes dead like it did for this guy, and you have no other options.... I would be more than happy to rely on a non-certified EFIS for another chance to walk away...