Why not leave them off?
I made subfairings for the RV-6A that my wife and I build to reduce the drag for racing. There is a lot of superficial thought about these things like fender skirts on a 50s vintage Lincoln and if speed is not important to you, you could just leave them off.
Some of the things I have learned in the past few years with the subfairings:
1 - Tires without smooth & rounded edges are not your friend - Goodyear Custom III works well.
2 - The most vulnerable area is the rear of the opening in the fairing where its edge faces the on coming tread head on. My other three opening edges are very close and actually sometimes touch the tire.
3 - If the intersection of the fairing opening is extended down closer to the ground there is an interesting operational characteristic. When weight is on the wheels the tires push up into the fairing where the "swell out" occurs up in the fairing above the opening, increasing the gap between the tire and fairing and when weight is off the wheels they extend down and reduce the gap which is exactly what you want for drag reduction.
4 - I made special chocks from 1/16"x3/4"x3/4" and rope that I take with me all the time because the chocks at FPOs are much to big to fit,
Bob Axsom
P.S. The subfairings increased the speed of the airplane. There was small gain the the MLG pressure recovery pants but a significant gain from the non-pressure recovery NLG fairing.