If you don't want Alienist, why not go with the good old Planeshifter? I would love to see how that level 9 ability Planar Area Swap would work with the Far Realm.

From the class- "The swapped areas switch back in a number of days equal to 10 + planeshifter level." This is 19 days of MADNESS, minimum.

Some kinds of Far Realms-obsessed Conjurer/Alienist/Malconvoker/Planeshifter combo would make a pretty fun bad guy.