Spring cover cropping new Swales

Hello friends. I am getting ready to embark on bramble clearing and swale making. The problem as I see it is with the amount I'm having prepared I need lots of seeds to plant immediately after completion. Because I don't have the money for all the trees, veggie, and fruit seed/plants I need I'm planning to cover crop. I'm a fan of winter rye and winter pea. Plus the seeds are fairly cheap. I don't think the winter pea would survive long after it warmed up here in zone 7. But what about the cereal rye? I think I could plant it in early spring and it could be my cover until I had something else to plant there. What does the permies community think?

Go from winter pea to cow pea when the winter pea dies. Take a look at "Iron and Clay" cow pea.
The cow pea will die in winter. Can plant tiller radish with the cow pea. Both will die in winter and you can plant in spring right into this area.

Good stuff there Alex. Many thanks.