Only thing is, I can't recruit Thorakitai anywhere.
I just checked thr Recruitment Viewer and, indeed, there seems that Thorakitai aren't available for Epeiros, even though they are in their roster in the EB site!!!

Maybe you could use more of Taxeis Triballoi (regional MIC 4 in Tylis and Kallatis) and Celtohellenikoi Hoplitai from Ankyra (when you decide to conquer it).