This story is an easy integration for any haunted attraction. As a story that spans multiple time periods and settings, with a demonic entity that twists and warps anyone who uncovers it, the integration opportunities are endless.
The various horrors in your haunt can all be integrated into the narrative as those who were unlucky enough to uncover this evil entity, and have been twisted by its influence in any number of terrifying ways, across any number of themes or rooms.
Best of all, the nature of this demonic entity, and the object it is implied to inhabit, are intentionally left vague within the creative, leaving the door wide open for your team to integrate this possessed object into your attraction in any form you see fit.
If that isn’t enough creative freedom for your integration needs, characters can be renamed, a completely different voiceover artist can be used, or the story itself can be retooled within the confines of the media that exists via re recording of voiceover lines and text/copy based changes on your website and ads to better fit with your haunt.