INHELLER

Try to mimic it width animated procedural texture. Or play width simulations without turning off the boundaries. Liquid must go away without boundaries - it's just spreads out because of gravity force.

Sorry, Houdini now unavailable for me, so I can't give exact instructions, but.
Idea! You can try to connect channels of “scaled” camera to the channels of original camera multiplied by scaling. Like: “ch(”../origCamera/tx)*0.5". Perhaps, you must do more work, but principle is something like this.

What if render scene and simulations in different layers and merge them in a composing stage? Just create a new camera and reanimate it same as the scene camera, but “scaled down”. Or, there must be a way to write a script, that will scale down animation to.

Again, sorry for my English.