Problem is that kind of thing is usually made by and for hobbyists. So it would require a ton of certifications to prove that it’s ok for life or death stuff.
And, of course, the current solution is formally proven fully reliable and has all these certifications.
(in which case, why replace)
You're going to run that on a computer from the late 1980s or early 1990s? And how do you get the data onto those computers when they're not connected to a network, or the same network, as your other systems?