Would it make sense to be able to find Duskull and Shuppet in the Mirage Tower on Route 111?

I'm making my own ROM hack of Pokemon Emerald that is essentally Pokemon Emerald: Challenge Mode. I'm trying to edit the base game and do what BW2-ChallengeMode did for Gen5.

In Emerald, Ghost Pokemon can only be accessed after the halfway point in the game, unless you want a Shedinja, and so I want to edit the game to allow the player to find a Ghost type earlier. I'm still going to keep them in and around Mt.Pyre, I just want there to be a chance to get them a little earlier.

I was thinking of adding Duskull and Shuppet to the MIrage Tower in the desert on Route 111.

The wild encounters on every floor would be-

Duskull 35%

Shuppett 35%

Baltoy 30%

Firstly, the direct translation of Mirage Tower from Japanese is Phantom Tower which I think lends itself to be able to find ghosts there. Also, after the tower crumbles away, an NPC asks if there were sandy ghosts inside.

I can't think of another location in the game where it would make sense for Ghost Pokemon to be found, other than the Mirage Tower.