Inflatable boattail backpack.
OP -- Your two motivations sound identical to me. I don't think ecomodding, as such, imposes speed limits.
My own ambition is to run an electric baja bug at Bonneville.
I can see why you want to change the saddlebags. What's inside? If it's a single battery, that's a problem. If they were packed with Tesla 18650 cells, then you could curve at least the outward face.
Do they need to be separated, or could you make a single U-shaped piece that wraps around the rear tire? Worst case, just rotating them to horizontal
might be an improvement.
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I thought the optimum "closure" angle was closer to 15*?
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You're not going to see optimum on the back end of a motorcycle IMHO. Too much upstream turbulence. A rounded rear, 30's style (Dymaxion/Volkhart Sagitta), might reduce crosswind response. Then you get the flat Kamm bullet shape (good for low fineness ratio), the full template boattail and finally the reverse camber to shift center of pressure backward. You get to choose from the first two.