Hmmm, maybe a Gaulish Earth
I don't know where I'll find the time for it, so don't expect it soon, but what do you think of a Gaulish Earth? POD would be shortly after the Alia in ca. 392 BC, no one is totally sure of the exact year, OTL or ATL, but it was within a decade either way of that year. Essentially Belowesos (known to OTL history as Brennos) follows up his victory on the Alia by giving Rome a very thorough sacking and burning. This doesn't quite eliminate Rome, but does lead to lots of revolts among allies and clients that do eventually finish the City off.
With a POD that early, I figure that both Philip of Macedon and Alexander are butterflied away, though a mercenary commander and the ruler of Thebes together unite the Greeks, and lead them into Persia. They aren't anywhere near as good as Alexander, and end up taking Anatolia and a large indemnity. After Persia loses Egypt and the Levant to various local rebels, a kind of mini-Hellenistic sets in, and lasts until about 200 or so AD.
The rest of the history is most exceedingly long and complex, but essentially leads to semi-Hellenized Gauls taking the place of the West as the dominant world culture. The culture and world order are VERY different from that of OTL, or from most of the other ICN worlds. Not only are the Great Powers, languages, and dominant religions different, but so are the ways the Great Powers interact with each other and the lesser powers. Likewise the economy is just plain alien, though there are a few elements reminiscent of Syndicalism. The tech will be about OTL mid-30s level, I'm thinking, though with some weird-tech resulting from a somewhat divergent scientific revolution. Nothing too far out, but it's just more plausible if these folks ask a few different questions than those we would think of, and get some different gadgets as a result.
Interested?