Speaking of using an instantpot for souring, I have one but have never used it for beer things. Maybe it's time to change that. I've never made a sour but am working towards it. A local brewhouse has one on that is so refreshing! It's like beery lemonade with just the right bite.... If I can get close to that without going too far I'd be pretty happy.
I just Googled "souring beer in an instantpot" and got a bunch of results so it IS a thing.