I believe anyone can buy a fish from a commercial fishermen. I don't know how many you are talking about, but the custom processor that fits your needs is going to be the hard thing to find.
In Alaska a fisherman must sell to a licensed processor unless he has a catcher/seller permit. The catcher/seller permit allows sale to anyone he wants, dock sales for example.
There are lots of custom processors who will fillet fish, vac seal it, smoke it, whatever you want....