We don't really know what Alexander's army was like - whether he used the traditional Epeirot irregulars mentioned by Thucydides in the 5th century, whether they'd converted to hoplites, or even whether he had already converted to a Macedonian style. We do have a mention of him fighting at close quarters with sword from horseback at his death (Livy 8.24), and that he enlisted 200 Lucanian deserters, one of whom treacherously killed him. A long time ago (under DBM) I drafted the following for an addition to a Later Hoplite Greek (or Italiote Greek!) list:
Only Taras in 334-330 BC:Epeirots:
Convert C-in-c to Alexander of Epeiros - as Epeirot Reg Cv (O) or Reg Kn (F) 1
Epeirot sub-general - as Epeirot Reg Cv (O) or Reg Kn (F) 0-1
Epeirot cavalry - all Reg Cv (O) or all Reg Kn (F) 1-2
Epeirot infantry - all Irr Ax (O), all Reg Ax (O) or all Reg Pk (O) 8-20
Lucanian deserters - Reg Ax (O) or Reg Ax (S) 1-2
Apulian subject-allies: List - Lucanian, Bruttian or Apulian
Alexander took complete enough control of Taras to be classed as C-in-c; Epeirot and Lucanian troops may not be under a non-Epeirot general. Probably the Kn(F) should be in SBE wedge under DBMM.
I didn't at that time include a hoplite option, but there are Molossian coins showing a blazoned hoplite shield -
https://commons.wikimedia.org/wiki/File:Molossi,_Epirus.jpg - so that should be an option.
In short, use the LHG list, choose Taras, and assume some of your hoplites and Cv are Epeirots! That seems to be the best option under the current lists.