Would it be reasonable to have a mage version of this spell?
One that would not have the alignment component?
Perhaps as a 5th level spell, as it is less powerful that the clerical version. As well, it would be similar to the invisibility/see invisibility spells (spell vs spell defense).
Perhaps have attuned items that would allow teleportation to work in that area (all kinds of adventures around getting/recovering an attuned item), with a similar cost as the password from the clerical version, for each item.
Of course, there would need to be an expensive material component, say diamond dust, to replace the holy water and incense. This would also not invalidate the higher level spell of dimension lock (which has no material component).