There's actually very little modding required to do this one. Edit the names (Epeiros to Pergamon, Epirote to Pergamene) in expanded_bi.txt (in \Data\text\), and change the colours (to whatever RGB combination you like - I changed the Ptolemies so it contrasted better with Seleukid silver on the minimap) in descr_sm_factions.txt (in \Data\). That's it for the modding, and even that's optional if you don't care what it looks like.
Then you start the game as Epeiros/Pergamon, use move_character to transport all your armies to Mysia, give Taras to the Romans for a ceasefire and trade rights, and once you've got Pergamon sell off everything in Epidamnos and Ambrakia, push tax up and let them revolt. You'll also need to disband your navy and get rid of your elephants. Helps to kill off Helenos Aiakides too.
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