In regards to NOTA, I'm not sure. It wouldn't be the best GP Farm, but it would make a decent one. We'd have to chop the three forested river grass tiles and farm them. Basically at that point the city could bounce back and forth between a GP Farm and a production city.
I'm currently saving the forested river grass tiles for lumbermills, though I have considered making this into a hybrid GP Farm/Production city.
I've already shut the game down so I can't recall off-hand how many specialists were looking at.
Another consideration, though it would take longer, would be to find a city spot with tons of food and settle a city there. It would take a while, but we could have the tiles ready before the settler even gets there. I don't think this is the best idea, but figured I might as well throw it out there.