Well, as every post processing effect there is somewhere an output bitmap that is rendered to the screen. So, yes, you can place your PP chain afterwards.

But wait for the next release in which I include a demo which demonstrates how to do that in the integrated SSAO mode, maybe I have to write some additional code to make it even easier (like chopping of the combine stage so that you can tinker directly with the AO-, the transparency- and the diffuse-channel).