Changing Hoplitai AOR and skins for KH?

[Paltmull]

I'm doing some roleplaying with Koinon Hellenon and I'd like to know whether it's possible to expand the AOR for standard Hoplitai (only for KH if possible) to, say, Camulosadae. I'm quite a noob when it comes to these things, so please describe as detailed as possible.

Also, is it possible to change the KH hoplitai skins:



to, for example, those that Epeiros have?:



Finally, will any of these changes be savegame compitable?