Not much confidence shown by biologists that Florida-strain largemouths will do well in the far North range like Michigan. I believe I have seen studies that have show Florida-strain largemouths have done poorly in the northern-most stockings and have actually harmed the 'native' northern largemouth stock by introducing a less hardy strain for our cold waters. The real problem would be once you let the genie out, you can't put it back in the box.
I don't see why we couldn't try to identify very large bass from Michigan and use their offspring to seed other lakes in limited studies. Maybe smallies too. There's been a lot of talk about genetics in bass in Michigan, but in the earlier parts of the last century, bass were stocked in many places in Michigan from many sources in Michigan and outside of Michigan, so I question many concerns about genetic 'purity.'
But I think we need to be cautious not to introduce bacteria and virus from other waters into new waters by stocking bass, especially 'private' stockings done by anglers on their own. A very risky practice. It may also be that some bass have already adapted to their local environment and the population could be put at risk by plantings that aren't well thought out and reviewed carefully.
You've touched on an idea that might have some application in Michigan. I can add it to my list of possible partner projects in the future.