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Starting out right at the end
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Without knowing your growing zone or how long you have before your region's frost date, it's a little tough to make certain recommendations. That said, I'm in favor of anyone experimenting and gardening so I say go for it!
Check what the germination period is on the seeds you are thinking of growing and add those days to the "days to maturity" listed. If that's past your average frost date you may have a tough time. Some spinaches are hardy enough to get stronger (and tastier) after non-killing frosts.
I did check out almanac.com to choose veggies that should* have enough time to grow before frost. USGA says "6A" is my growing zone
You should be good with the spinach and radishes, we're in 5b and are still within the window to get harvests on both of those. I haven't grown kohlrabi before so I can't speak to that specifically but I'd expect them to do pretty well for you. If you include onion or chives in one of the pots you could expect to get scallions as well.