So I installed FStorm. Then I added support for all its render properties (except for the interactive ones which make no sense on Deadline), and rendered a test. I hit an issue where the active viewport would render black unless an explicit camera was assigned, so that seems to be a bug (we had similar issues with other renderers in the past). But once I created a Physical camera, both the Beauty RGB and any FStorm RenderElements rendered correctly on Deadline.
I will polish my changes to the various scripts and param files, and will see if I can get them included in a future Deadline point release. I will log the Camera issue separately, as it is likely something that happens at C++ level in our integration plugin…