In I proposed two different conversion schemes. One set Blackmoor back in 336 CY and replaced the Afridhi with the Relentless Horde. The other set it in more or less the present World of Greyhawk with Iuz taking the place of the Afridhi. The Skandaharians get replaced with the Zeai (the Sea Barbarians, closely related to the other northern Suel barbarians) in both cases, and the Egg of Coot stays the same.
There's another possibility, if you don't care much about fidelity to published Greyhawk canon. You can change the map and drop Dave Arneson's Blackmoor just north of the Great Kingdom, approximately where Ratik is in the published map. Something like this:
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