Game speed modification

I already know about Global Time Dilation component, however, it manages to increase game speed to about x20 of the base game speed.
With a solar system I would need a several thousand times increase in game speed. I know it cannot be normally with time dilation, because of performance, but would there be any way to e.g. decrease the number of calculated engine iterations in a time unit in order to achieve the same performance with a game speed somehow (most probably not with Global Time Dilation Component) increased for example 5000 times?
I also thought about changing the math/physics algorithms regarding system bodies’ movement, so that they would create an illusion of being simulated quicker, but what I find troublesome is that most of them are still tightly connected with UE4 physics engine and thus such forced faster simulation is unlikely.