Thanks for fixing the video URL. Now it's easier to understand what you want to do. You can see that the length is short, but it looks like a workable system. I am skeptical about the 15° rating for this setup (looks more like 45° to me), but otherwise it seems okay. If you want to use something like this in colder temperatures, just use two sleeping bags end to end, overlapping some in the middle.
Good luck!
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