Morlocks! You are forever on my nifty list. I love that movie.
To answer the question though I think it might work just the opposite physically. Given the Eloi were largely useless and had pretty much no sense of danger (they just sat there while she was drowning...), I would think the grain eaters would end up more like the Eloi. They behaved more like livestock to me while the Morlocks were more toward the top of the food chain. They had the presence of mind to lure in the Eloi after all thus ensuring their survival...at least until Rod Taylor showed up...
Of course if it means looking like a Morlock well...might have to think about that.
side note: After reading this over I have come to the distinct realization that...I am a nerd.