I'm not certain what triggers the late_bodyguard switch in any event. In RTW, it was the Marian reforms, caused by building the first Imperial Palace on the Italian peninsula aside from Rome. If you can find that switch, it might be possible to add in a greek_late_bodyguard unit that uses the dragoons, but only if the trigger is post-gunpowder.
Personally, I wouldn't give dragoons a long range. Camel gunners are supposed to represent those Bedouin tribesmen who used long muskets/rifles from the back of camels, so long range there is fine. Dragoons used carbines or pistols; their ranges should be much shorter, perhaps slightly shorter than arquebusiers even.
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