a mill bastard should do you fine.
i would suggest grabbing a couple- a large, course bastard to bring the bevels together (alot of machetes don't actually have edges when you get them), and a finer one to smooth out the scratches before going to a stone, or you can leave it at the fine file finish.
or you could get an harbor frieght 1x30 belt sander for the price of about 5 or 6 files...