You CAN break up PTDY as others have said. I’m not sure that after being gone for 2 months that I would have wanted to come back to work for 2 days to out-process, like you are alluding to. If it is approved as terminal leave then your plan will not work. If you can convince your CC to sign an ordinary leave form for 60 days and then you come back, sign in and go out process then good luck to you. In my experience, this won’t happen but YMMV.
Also, in your scenario expect your pay to be delayed and screwed up due to DFAS issues with processing it like you desire.