Obviously I'll make a roux, the trinity, and use vegetable stock. I'm thinking maybe mushrooms to give it a "meatier" feel?
I have done this a couple of times for my mom who doesn't like meat (I definitely did not get that gene) and wanted something besides vegetable soup.
I also used veggie stock, but had to add more salt than what I would've liked. I ended up cheating a little and added bacon drippings, but I think adding salted butter would work as well.
I made the roux extra dark and used lots of mushrooms, which were a very good addition, IMO. I also put in extra okra and diced tomatoes.
It turned out alright. My mom loved it, which was all that mattered to me. We meat eaters crumbled the bacon I fried for the drippings on top.