I did run valve sTems only very successfully for about 10 years. I used a racing valve with a nut on the outside that you tightened down, A RUBBER SEAL ON EACH SIDE OF THE RIM. I used silicon sealer to seal them, both sides. After I had the wheels stripped and painted I sprayed on a mag wheel sealer to prevent leakage. Tubes are so much easier.
DICK RUZZIN