It really shouldn't be that difficult to do a boattail for the Insight. The curved part of the rear end is just one moulded plastic piece that is easily removed, leaving a flat bulkhead. (And the rectangular aluminium bumper that's normally covered.) Mount a block of foam to this surface, perhaps with a couple of brackets or whatever for strength, carve it to shape, and cover it with a light skin. If done with a bit of care, it could easily be swapped with the original moulding for A/B testing...
(I own an Insight, and thanks to having been rear-ended got to see under the skin...)
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