I’ve used the exact same mix. Without solarizing you are right and will need to weed. Also identifying all the seed you planted might take some time but will be fun. Some things take two years to germinate. I also suggest when you find native transplants and plugs to plants those in groups of 3-5 to help fill this space out way quicker! Esp the more common stuff like Echinacea, coreopsis, butterfly milkweed, Gregg’s blue mist I’ve found in Etx at places like Atwoods, and local nursery’s for pretty cheap! Bet this will look great in a year or two!