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I would not recomend having a field tip in your quiver. i've heard of a guy that accidently pulled one out and shot a elk with it.
The way I read the regs field points are legal for grouse, or anything other than big game so that should answer your question. I've seen plenty of grouse shot with a bow and its really easy for them to fly or run off after the shot, and it would be even worse with a field tip. I'm not sure where you hunt but where I hunt it can be pretty hard to find them sometimes if they get off the road. Thats why I suggested the head shot with a judo tip. Check out page 75 of the regs, line f:f. It is unlawful to hunt big game animalswith any arrow or bolt that does nothave a sharp broadhead, and thebroadhead blade or blades are less thanseven-eighths inch wide.