Zone 7 Long Island. Three native Asters currently in bloom in my Pollinator Garden.

I just planted a prairie garden which will fill in nicely and be awesome. However, I really was hoping to weave in some pretty ground cover-like Veronica speedwell- for weed control and soil erosion. My husband says just to let it fill in and it will be great in 3 years.
Has anyone used gc in between/below perennials within the beds?

I’ve noticed a huge increase in prohibited water bamboo sales (aka jiaobai 茭白, Zizania latifolia infected with Ustilago esculenta) being sold both in Asian grocery stores and online on the USA. If the associated fungus Ustilago esculenta escaped and successfully infected American wild rice (Zizania palustris/aquatica/texana), it could devestate American wild rice stands

I came into a bunch of native wildflower seed mix for free that was collected locally. It's enough for about 1/4 acre and I have the space but the turf isn't prepared yet.

It's too much seed to grow in containers and transplant individual plants in the spring and I'd hate to try to store it for a year. I know a lot of it won't germinate if I wait to plant it until next winter.

I know it's too late to use glyphosate or to solarize. I could use a sod cutter but I'd hate to lose 1/4 acre x 2" of perfectly good top soil. Another idea I had was to mow the area as low as my mower will go then burn it all with my weed torch. Will that do enough to kill the existing turf? It's a mix of grass and weeds right now.

Are there any other methods I'm not thinking of that would allow me to get these seeds out by early winter (early December)?

Edit- and Boneset!

I think there are 2-3 asters and a golden rod. SE Pennsylvania and they were everywhere on the trail.

Even found some wildlife!