First let me repeat that leagues are free to use match play instead of round robin, but unless you are a deciding voice in your league, that doesn't help you.
Have you heard of the USAPL? Like the BCAPL, the USAPL is run by CSI. The USAPL uses FargoRate to rank its players, and it uses the same game rules as the BCAPL. However, the USAPL's matches are structured similarly to the APA, so that lower level players get a more fair shake, and 9-ball matches are not a one-game match.
The USAPL has a national championship that plays concurrently with the BCAPL Nationals.
I have given serious thought to starting a USAPL league (my wife might kill me though) and seeing how it goes. It would be great to see some leagues start up on the west coast.
I've heard of the USAPL but I don't think there's any leagues in my area. Looks like the closest one is about 5 hours south.