I'm definitely interested in your other short season squash.I'll definitely let you know.
Our typical daytime temps in mid summer are around 18 degrees and not much more than 10 degrees at night. A heatwave for us (rare) might make it to 22 degrees. We can't even rely on 10 degrees at night until July. However, I have a polytunnel and I have heating wires and solar energy so I can help it along early in the season.
The easiest approach would be to grow it in containers that can sit on my heated bench. That way I can give it a bit of extra heat any time the temps drop too much. I understand the vines grow to about 4 foot so there should be plenty of space. My only question is whether there will be enough nutrients and water in a smaller container? I'm thinking of something around a foot deep and 14 inches wide. Straight sided tubs so as wide at bottom as at top. What do you think? Alternatively I have 2 foot deep raised beds in my polytunnel and larger 60L tubs on the ground but they'd be harder to heat.
I'm also trying some short season/cool climate winter squash if you're interested in those too?
Thelma Saunders Hubbard
Anna Schwartz Acorn
And even a semi-determinate tomato that might have a chance outdoors in our climate
Latah
You definitely have some challenges to overcome to grow anything.
It may be to late but I have some dwarf tomatos that are short season plants. They are called "golden hour" and "mini marzano" they were created by "wild boar farm" in the United States. Once you check them out, if you want, I would be glad to send you seed if it is possible. Or you can get some for next year.
As far as the container goes for the Minnesota midget, each rarely produces more than two vines and so I think your container will be ok. However keep in mind that I don't do container gardening.