I just listened to that episode the other night…good luck at Leadville!!
While I can’t point to any data specific to legs, it is pretty well established that cloth is faster than skin (unless your name is Remco), so it would stand to reason that almost any leg warmer is going to provide some degree of aerodynamic advantage over the just the smooth surface of the artificial leg.
AFAIK, the only aero-specific ones are from Rule 28, as you noted. @Rule28 posts here, so perhaps they may be able to provide some specific advice for you and your situation.