You will have to till it in the soil or else winter wheat and crimson clover will out-compete the veggies. I'm not sure about your climate, but here in humid cool climate it's very hard to establish veggies in cover crop. If you don't till i have to cut twice or more before veggies from seedlings are big enough. Sowing is even more work. Winter wheat is a grass basically, competition all over the place, crimson is also very dense and strong. I like to sow cover crops that don't over winter. For example potato field. When potato is harvested, buckwheat, sunflower, salad, mustard and others are sown. They make a great
root and above ground mass before winter. In spring the field is prepared for planting, no additional work to be done, just planting. Above ground mass is mulch,
roots start to rot over winter and in spring the process is accelerated, so no tilling, dying roots do the job. plenty of food for the plants also.