OD: I was thinking of a more traditional bug net too. I think a net supported by the ridge line would work better than a TED bug net in this idea. I do think organza (used in my TED) would be a good choice for a bug net/underquilt combo because of its strength and lack of stretchiness.
Like you, it occurred to me that a bug net/underquilt combo might be better suited for a summer set up. (Although, 20s?!?!?
I'm going to think about this some more. You do the same and let us know what you come up with. Thanks, my creative brother!