Interesting. 60-80% of applicants to b-school. in any given year are looking to make a career transition of some sort. Given your interest in operations and experiences with manufacturing clients, this seems to be obtainable for you. This compounded by your interest in the more statistical side of operations, which would connect nicely with your accounting background.
I would recommend that you look closely at schools who are well known for their focus on operations / statistical managment. MIT immediately comes to mind. I believe that you wouldn't have too much difficulty making that transition.