Crown-Prince is the english version of Pavlos' title.
In Greece, the successor to the throne had the title Diadoc/Diadochus.
As Head of the Greek RF, former Diadoc Pavlos should be known as Prince Pavlos.
Eventually his elder son should/could be styled as Diadoc.
As you mention, in English he is crown prince. He will remain as such and it is more usual than not that former crown princes retain this title even once they become heads of their houses. After the former king *and* after the former crown prince, the title is not used (or rather, should not be, since a crown prince only follows a king).
The Crown Prince of Greece’s eldest son may now be reckoned to be “Hereditary Prince of Greece” in his father’s lifetime. Once Crown Prince Pavlos is gone his son Constantine-Alexios will be *the* Prince of Greece.
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