So he'd have to drop off the anti-monarchic bits ? Wow, big deal. And it's not like the Greek philosophers were anything of an united front in the issue of freedom, nevermind now having some pretty selective ideas about it in general. Slave-using society, remember ? Ever read Platon's State or whatever it's called ? That's a bloody dystopia by modern standards...

Now look. Imperial nationalism only became the order of the day in the 1800s AD, and then only half because the rulers had to adopt it to keep in the good graces of the (more important) majority segments of their subjects. As a rule of thumb before that they could hardly have cared less so long as their subjects paid their dues and didn't try to buck their overlords; this was particularly the case with "classical" empires of the Persian/Roman/Macedonian type. Even the more religiously monolithic ones were, whatever their rhetoric, usually willing to tolerate odd religious minorities (although only rarely "heretics", however defined; sectarian squabbles being notoriously often more bitter than those between main religions).

It's not like Persian overlordship over Greece wouldn't have resulted in a history different from ours. It's just that there's no real grounds for assuming such a history would automatically have been "worse" solely because the almighty, all-important Greeks didn't get to do their thing the exact same way they actually did.