Using Unreal to help create sprite sheets possible?

So, my goal is to be able to render many different high quality animations generated from particle systems on very low end mobile devices. To achieve this I thought it would be a good idea to render out a “clip” of a particular particle that can be looped. I wanted to set up a window that I could “record” a particle system for a few seconds and then extract out the frames into a sprite sheet. This way I can then reuse them for low end systems.

For example, my game will consist of several “stars” generated on a board that slowly rotate with beautiful lighting. I wanted to record a single “star” particle and convert it from a movie to a sprite sheet that can be animated for later usage. That way I can bake in all of the beautiful lighting from a high end machine and use it for lower end mobile devices…

How would you go about doing this with unreal? What tools in unreal can record and what tools can I then use to extract out each screenshot for an eventual composite sprite sheet?

What are the alternative solutions if you don’t think this is a good one?

Thanks,