[Radek]

I am supposing that the entrance wall is down and Morguemaus cannot enter the shrine. He has left the shrine at Bloodbeard so that the lever at the front door is down.
I don't know whether the wall will go up when you approach it from the outside but every time when I do the following:
- go through the shrine to Kerah,
- take the Leprechaun treasure,
- Call of Home to Brimloch Roon,
- Teleport back to the lever of the front door of the shrine,
the wall and the lever are, of course, down. I have to click the lever twice. First, the entrance wall goes up and then it goes down and the dungeon loads. Let us note that the action described above must have the same result as leaving at Bloodbeard, teleporting to Brimloch Roon and then going to the shrine.

Sure, if it is possible to enter the shrine then the simplest thing to do is going through it.