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Someone has already valued their life at a greater value than the cost of a new rim but you think "Bargain"
That's because only a certified genius like me would think of using it with a fixed hub (sarcasm if it wasn't obvious enough)
I do think an aero fairing could work though. Cut the brake track away, slice it in half and fix it onto the rim either side of the spokes. Or glue it onto an aluminium rim and rebuild it. For fast flat stuff like a TT where weight isn't a concern and you don't need it to be structural.
frankenbike-
If you were to discard the rim bed part and bond the U onto a lightweight aluminium rim, there's a few stumbling blocks.
~40mm in, your spokes will have a large stagger, compared to the original nipple holes.
Are you going to use inverted nipples so you can true the wheel once it's faired.
Sometimes genius and madness are easily confused.
user69121
Even if the material isn't worn away by what you decide is "too worn", how would you know that the resin/bond was still structurally sound and hadn't been degraded by high rim temperatures?
Someone has already valued their life at a greater value than the cost of a new rim but you think "Bargain" 😉