I don't really see your issue. If you want the object to be rendered behind everything...
Thats exactly my issue. It's not possible to render an object behind "everything" across more than one render pass.
What I want to do in special:
1. Render Pass: Render specified objects, hide all other.
2. Render Pass: Apply some "special effects" via blend mode add & multiply
3. Render Pass: Render rest of world including skybox the normal way.
In result my effect is only applied to the objects from the first pass, which would work fine if my skybox just wasn't redrawing all that stuff from the earlier passes :-(
So the only thing I can do is to forget about EntityOrder and scale my skybox really huge to ensure it will be drawn behind all other objects anyway.
Hopefully I will not run into any problems with CameraRange then...
It could be so easy without this EntityOrder bug. Grmbl.