BA, Cook's Illustrated has a recipe for a blueberry galette made with rough/quick puff pastry that might be a good use for those slightly over-ripe berries.
This link seems to work today, but with CI you never know:
https://www.americastestkitchen.com/cooksillustrated/articles/8168-how-to-make-a-blueberry-galette
Another possibility is a clafoutis, which is easier to make. Another link that may or may not work in the future.
https://www.epicurious.com/expert-advice/how-to-make-clafoutis-with-any-kind-of-fruit-article
I think clafoutis are similar to Dutch babies, just thicker:
https://www.thekitchn.com/how-to-make-a-dutch-baby-pancake-227629
I've sometimes wondered whether the batter for a Dutch baby could be frozen, I'm pretty sure the pancake itself could be.