It pains me to say, but the stock Google camera app is by far and away the best option I’ve yet found on Graphene. Which has to pair with the Photos app, or you can’t actually do anything with the photos it takes.

However, you don’t have to sync either with Google (though you do have to sign in), you can set Graphene to only allow them access to the folder they need (while they think they have wider access), and you can turn off network permission.