I’ve been to Sand Pines and they were pretty flexible as long as you go on a weeknight. They let us do 6 if I remember right but even that was too many probably. 8-12 is a lot especially if they put you in a smaller area. I’d call around and see who will let you scratch hunt, they have plenty of birds out in the fields already. I guess if it’s a flushing dog it doesn’t matter as much but tripping over birds everywhere they turn isn’t conducive to a pointer learning anything in my opinion.
Another option is you can probably buy some birds from Oakwood Game Farm and do something on your own a little more controlled. Pull some flight feathers, hold them by the feet and spin them around a few times, and they’ll stay about where you put them. Pheasants are mean as hell though and will kill each other if they are together so either get a couple extra or have some way to divide them in a box.