Parmandur
Book-Friend, he/him
Honestly, you wouldn't need to change anything about D3: that can be just a terrible Drow city, same as Stoink is a terrible human city. The Underdark of Greyhawk is, no doubt, humungous.@Snarf Zagyg
Re the Drow in Flanaess, just make it regional. There is a cluster of Drow cities where the "Lolth faction" has taken control. But elsewhere, the Drow want nothing to do with Lolth.