Make UI Particle System not scale

I'm currently trying to fit several particle systems to my UI, and I have ran into an issue. I am currently using an Orthographic camera that I can zoom in and out. Zooming, however, causes particle systems to scale. This includes the UI particle systems.

I have managed to bypass this on my "static" particle systems (non-moving, constant-size particles) by setting the min and max particle size in the renderer to the same value, which disables any sort of scaling on the particle system.

This workaround does not work on moving particle systems, and herein lies my problem; I simply want my particle system to not scale based on the size of the camera.

I am aware that I can create a secondary camera that renders a single layer with all of my UI particle systems, but I've been told that this will have an impact on performance. As such, I would rather avoid using this solution, if possible.

Thanks in advance.