For a start, I think that the easiest thing to do would be to just have maybe six 'print containers' all sharing the same water supply but each one with a different resin in it. Build the parts individually and glue them together afterwards. This requires only a few extra water containers, and no 'active' hardware.

The Peachy design makes this very easy because you can print the parts together simultaneously - the laser can reach all of the containers and print different parts in each one with no extra user input.

With an FDM printer, you'd have to do one part, remove it from the bed, swap filaments, do the second part, remove it from the bed, swap filaments, do the third part, remove it from the bed, swap filaments, etc. That would take ages.