If you want a way of phrasing this problem which involves the agent being in an attainable state, this may be of some small interest, Alexandros. A few years back I wrote an article discussing a situation with some similiarities with the one in Newcomb's problem and with an attainable-state agent. While the article doesn't prove anything really profound in philosophy, it might give a useful context. It is here: http://www.paul-almond.com/GameTheoryWithYourself.htm.