I think the best approach may be to look at this in terms of branches of government; a prohibition on anyone in TSP's executive branch holding an equivalent post elsewhere, but no restrictions on them serving in a foreign judiciary or legislature.
Minister of Media, Subversion and Sandwich Making
Associate Justice of the High Court and Senior Moderator
Former Delegate (x2.5)
Former Member of the Committee for State Security
Former Chief Justice of The High Court (x3)
Former Minister of Foreign Affairs (x2)
Former Chair of the Assembly (x3)
Former Minister of Security (x2)
Former Local Councillor (x2.5)
Former Forum Administrator
Former Minister of Media