Possible to make opera house accessible when Portnip doesn't spawn?

[Pandip]

In light of the Sunpurse CASTIGATE event, it is a bit of a shame that this awesome area is explicitly used for a quest. How difficult would it be to make it so this area is accessible as a regular area (maybe with occasional small ghost spawns?) as a meeting place for PCs whenever Portnip doesn't spawn during a reset?