Board Thread:General Coding Help/@comment-746824-20150214065957/@comment-11733175-20150214104113

Preferences are global, there's not really any way to alter them on a per wiki basis. The exception is uncyclopedia, but they use a separate database as far as I can tell.

However, you could use some js to append ?useskin=monobook to every link on that wiki and add it to the URL if it's not found for when you first access that wiki.