The only 2C that you're going to run into that is made in the United States is 2C-B. That does require 2C-H as a precursor. Perhaps it will be a little bit harder to find but a competent chemist could make it from another precursor. 2C-H is a precursor for the halogenated ones (and 2C-N). That means 2C-B, C, I. 2C-D, E, P are all synthesized from a different route.
This is all moot though because 2C-C, I, and a whole host of others are also getting banned. Other ones will pop up though, I'm sure of that. There are at least three other 2Cs I can think of that I expect to pop up after the ban. And then there's still a bunch of FLYs, DOs, and other classes that have barely been explored. There will be more phenethylamine psychedelics.