Do you need different files for those? I've changed between 9, 10 and 11 on my guitars and friends guitars without doing anything to the nut, I just presumed all stock nuts are cut slightly over size, to accommodate all modern 'standand' string gauges? Do people cut nuts perfectly to a single string gauge usually?
Width isn't the only reason you file slots. There's much more to it with angle and depth optimized for ease of playing and intonating properly at the first couple of frets. Plenty of guitars, even new ones, have nuts that aren't cut correctly.
As others have said, just buy good, correct tools for this. The 'how can I avoid buying the nut files that are the right tool for the job' thread is a quarterly event, here. The words wasted on cheap workarounds, laid end to end, would stretch for miles.