You don't need a special post processor to use the 2010 Screenset. Regardless of which screenset you use, Mach3 still runs the code exactly the same way.
The only thing my custom posts really do is remove the first tool change, to avoid zeroing the first tool twice.
The standard Fusion 360 post, though, has a lot of stuff in it that I personally wouldn't want. But code that it creates will run the same in Mach3 regardless of which screenset you're using.