I have a """few""" carbon plants, but not a lot of space... how much can I stuff in my garden/jungle

Hello !

As May is upon us, a few interesting plants will soon be able to be sown, if not already. I've bought last year a pack of seeds of carbon plants (who produce a lot of biomass, to feed back the soil). There are a few that I actually planned to use, but there are too many other who will just be waiting either for last year, or for more space (and that's not for next year, unless the neighbor accept to surrender their garden... I really want to squeeze as much as possible in there.

Here's the list of seeds; only the rice is a unique variety, all other are a mix of several:

Duborskian rice (a russian variety)

Quinoas

Amaranthes

Sweet corn

Sunflowers

Sorghos

Wheat

Millets

What I planned to grow the rice which is a variety that is adapted to dry cultivation, sunflowers and sweet corn. The rice will have a dedicated spot (with probably some kind of ground cover too), sunflowers and corn too; those both will also have a few random spots in the garden.

The wheat is a winter variety, so it's for September.

Is there any trick, anything I can do to grow some of the other plants, In enough quantities ? Can they grow in spots with less sun ? In pots ? Can they grow very close either together, or with other plants ?