If I wanted to create a system-neutral adventure, would that be acceptable? I can see short adventures that would easily cover Cepheus Engine, Cepheus Light, Traveller, Scum & Villainy, and other systems.
You can definitely make a system-agnostic adventure. When you go to submit, just type “system-agnostic” in the field where it asks what system the adventure is for.
This is also the same process if you’re writing a Free Kriegsspiel Revolution adventure.