Your agenda may not be everyone else's agenda. That often happens in life.
I don't have an agenda, the last time I shot slides, of either type was 1982, so it's more an idea of sober thought. If film transparencies are important to you, then you either need to work with current materials in order keep what you have now or you need to find a way to economically get slides from C41 negatives, possibly by using a motion picture print film. If you really want a business concept it would probably be the later, custom building a film printer that would work with a single negative to print them on MP film which would then be processed like any other MP print film, you would then cut it into slides and mount them. You might need to put a tracking number on the film stock itself, to know which slide goes with which negative in your process.