Our means to incorporate the other Italiote Hellenes into our system would be a "League of Leagues", I suspect, given each of the major cities has a collection of minor tributaries, albeit not on the scale of the Epulian League.
As regards our psiloi, I'd been pushing for us to formally establish a corps of Euzonoi since the Battle of Canthra, when we first defeated Harpos and swiped a huge pile of Peuketti panopoly.
@Cetashwayo what sort of costs would be involved in designating say 500 of our better psiloi as Euzonoi and paying them a maintenance stipend? I'd assume they'd get a lower amount than the Ekdromoi.