[Briscoe]

My question is, is it worth it for the devs to attempt to roll out Velious with the pre-revamp Velk's?

A quick search of the usual websites yields virtually no information about the zone before the revamp, precisely because no one ever went there. So unless the devs have access to some great information, I don't see how they can even implement the pre-revamp zone as it truly was without investing a ton of effort. Would that even be worth it? Might as well spend your time on the version of the zone people are actually going to use (not to mention the permanent version).