Imageio just needs Numpy. Believe I was able to find a whl of that that did not require a recompile to work with the maya version I'm on. Had similar luck with openCV2, which is only required for image operations btw.
PIL has conflicts when the visual studio version it was compiled with does not match the python build Autodesk compiles for maya. In my experience that has not been the case with these alternatives. Not that there couldn't be a conflict in the future, but so far everything has just worked.
I've been able to successfully perform my image actions in both environments from the same modules. PIL was a pain, requiring a seperate build for both the maya version and standard python 2.7.