If it were a practical thing to do, I'd throw my name in the ring for MyVMK Grammar Guy. I would love to help out the game, and correcting grammar is kind of my favorite thing.
That said, I don't know if having a specific editing person would necessarily mesh with the rest of the development process. If it wouldn't, grammar and spelling aren't top priorities. It's nice to have that polish, but finish the game, and the couple of spelling mistakes that are there can be patched up later.