USPSA (IPSC in the USA) classifier strings tend to be short, so 7-rd mags are not a big disadvantage, especially since you can start 7+1. Remember, the original 1911 had 7 rd mags. I expect more New Yorkers going Single Stack and Revolver. (Is a moon-clip considered a magazine under NY law? S&W 627 holds 8 rounds)
USPSA match stages, other than classifiers, can be designed with whatever round count per shooting position, up to 8, per the rules. Dropping that to 6-7 is not a big deal.
Or do what the Texas AG said; move to Texas.