Simulation of long level load times

Yes, a strange question, but I am looking for a way to increase the loading time of a level.

Similiar to the Network Emulation, that can be enabled in project settings to simulate bad networks in multiplayer, I’d like to be able to simulate long level load times to test my loading screen behaviour. I did not find any entry points where I could hook in to insert some delays that would work with MoviePlayer based loading screens.

Making a huge level just for this could be an option, but definitely not the best one.

I’m curious, if someone has an idea how to get into that.