You could consider a set of extension tubes, really depends on your budget and how much detail you need to capture. You'll lose some light and DoF, but they are pretty cheap. Macro's can be used as normal lenses though, so you could probably sell the 50mm and have a portrait/macro all in one.
As said, depends on how much your boss is willing to spend. Can't really advise on Canon fit, but the Panasonic 45mm macro wasn't cheap.