The problem with "analogue" black holes is that they are modeling what we think we already know about black holes. So we've essentially looked up at space, said "There's a weird thing that breaks the laws of physics and works like XYZ, so let's model exactly XYZ to see if the behaviors match up to predictions in the lab."

You shouldn't expect to find any surprises if your lab mockup of the thing you're studying is based off the predictive models.

To find something novel you need something that actually does break the laws of physics, not something that will merely produce the same result if our assumptions about the object were correct. It's kind of a tautology.