The process is entirely reversible, with basically no signs left. Nlaunch CX will actually install the real CAS OS for you, so it'll be fully functional. I'm actually looking for the install guide and the executables also, so bear with me.
Also, just as a side note, the process of installing a CAS OS on a non-CAS calc is a bit of an edge case of piracy, because you're paying less and get more. It also shouldn't be used for cheating. Of course, I'm not implying you want to do that, but just sayin'