Arverni recruitment?

Here's just an open question, in the hope that someone can answer me...

What exactly are the Arverni supposed to be able to recruit in Italy? Are there any regional units that they can recruit in Level III/IV government in the starter Romani provinces? Because currently I have an Arverni army stuck in the Roman provinces absolutely incapable of retraining because all I can recruit is Lugoae and Sotaroas, even though I have Rome and an ultra-developed MIC complex. The nearest stop for retraining is a long withdrawal up the peninsula to Bononia, which would mean uncovering southern Italy to an ominously growing Epeirote army at Rhegion/Tarentum, and I am loath to do that, but at the same time I can't pre-empt the Epeirotes because I simply don't have the strength to be confident of victory.

What type of Roman units should another faction (with similar or very distant culture differences) be able to recruit inside Italy though? I suppose if there are type4 or maybe even type3 govts that some lowest level troops should be recruitable - but what should they be?

I was thinking something like accensi/leves at the minimum, maybe even the hastati-principes-triarii structure in Level 4, the loosest government system. After all, those were their citizen troops, so if you let the romans keep the bulk of their government system they should also keep their military systems.

Weren't there some regional Samnite/Apulian/Bruttian units planned? If so, then maybe there won't be any more need to rely on Roman troops in the peninsula. Barbarians, for example, would not be able to access anything other than the Samnites etc except in Latium where the has-prin-tri is available on level 4, and leves at level 3.

On the same note, does it make sense that you can recruit Lugoae and Sotaroas in Roma? It's not exactly a Celtic city...

Perhaps instead of Lugoae, you should be able to train the Roman equivalent. That'd make a bunch more sense under Lvl. 3-4 gov's.