To be fair, I should clarify that when Singapore would swap out Shrek 4D for Scared Shrekless during the spooky season, it did NOT include 3D (obviously) or 4D effects.
While a film swap out seems simple, it is the opposite, especially if you want to include in-theatre seat, effects & projections included. So a day/night switch wouldn't be a viable option from a technical standpoint.
It would be fun to see SHREK 4D return briefly (or one of the other spooky season DreamWorks short films)