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I was reading a tribute today to recently passed local musician Allen Hart, and a comment in the fifth paragraph from the end caught my attention. It mentions that one project he had been pursuing was a changeable key concertina, based on being able to swap out harmonicas. The source is here: https://folkworks.org/features/passings/46726-rip-al-hart No detail is offered beyond that, but the notion does catch my attention. I'm imagining a twenty button Anglo design with a harmonica for each button row. Perhaps a latch on each end, and the ends hinged with appropriate edge seals) to permit quick access to the internals and the harmonicas in some sort of ducted (for air passages) frame with a quick release holder. There are several mechanical issues that come to mind, not the least of which is that you might need two harmonicas for each button row. One on the left side for the low note buttons and one right for the high note buttons of that key to cover the full range without needing to resort to complex flexible internal tubing across the bellows. Or maybe he was planning to have all the buttons on each end all one key, so that you might have G on the left and C on the right. I did not know Allen, but it would have been interesting to see his prototype.