I want to do a reverse Alexander thing.

[Unintended BM]

As Baktria. I want Diodotus to subdue the natives by basically taking a few regions from Parthia, Saka, and maybe one of the Indian regions, then have his son go on a rampage and take out the AS, Ptolemies, Makedon, and the KH with all the new resources I get from Diodotus Sr.'s small conquest.

What should my army composition be for both conquests? For the Phillip-esque part of the game, I think I could probably just go for any cool units Baktria has, because I'll be close enough to my homeland where retraining won't be an issue. For the Alexander part, I'm thinking of having a core of pikemen, and at least a unit of all the elites available, then just get some more generic troops that are disposable and replaceable. Which troops would be good? Should I have a lot of horse archers or elephants? Has anyone ever tried this before? I think it might be difficult getting all the way to Greece in Diodotus Jr.'s lifetime.

Also, what regions would be good to take during my first small conquest? I want the richest available regions to help fund my massive army.