Those provinces in Thrace do not have any factional units really. You need a Regional MIC there. And the vanilla Marius Reforms are the March of Time in EB, and they replace certain nation's bodyguards as well as adding a pike phalanx unit for KH and your faction, Makedonia.

Those Eastern provinces have more factional troops available because they were long under Seleukid dominance, meaning Hellenic ways of warfare managed to take firm root there, thus providing you with recruits.

In any case, use the Recruitment Viewer to find out what you need about where to recruit certain units and what MIC (barracks building in EB) they require.