Try it and see?
Not going to cost you much, and might produce a good enough finish for what you want.

Another option I just thought of, is cut to near size then finish on a linisher (aka belt sander) using a jig to set depth. You're not really needing the accuracy of grinding, and a linisher can produce as good a finish, but just not as accurately, but they are capable of removing metal far quicker than a surface grinder.
And thinking along similar lines, maybe a worden style of grinder?