no, the premium stuff doesn't give you api access. which is total bs, but yeah, it's only for that grey interface. (i'm also quite salty that the playground has no easy to access image inputs but that's beside the point)

you're completely right about self-hosting sd, it's just a matter of prompting. sd workflows tend to get a little more experimental but i guess you could still make chatgpt write a few prompts that are close to correct and just manually rerun if an image failed