Render queue, more layers? I'm using particles to create letters (on Cycles), but there's a little problem: I have 15 separate letters, that are geometry, every single one have two particle system, so with those I have 30 layers already (I didn't have created every single one for now) plus the light layers and another important objects..

The thing is Blender is only able to keep 20 layers but I'll need at least 40 layers, so I can properly put everything on its place. Maybe I can just open two files and it'll be the solution but still there's the problem that I need to render 15 renders (because after that I'll change the duration of each one in After Effects) and 15 more because I need the render with different textures...

So, it's a big problem now, I may be able to solve it with two separate files, but how do I render more than just one item? I mean, can I make a render queue attached to a layer in Blender? If not, I'll just have to manually modify the 15 particles with different speeds and timing...
Can you not assign different materials to the different particle systems (Mat 1 and Mat 2) each with a Pass ID, and then assign an Object ID (Letter A, Letter B, etc) to each geometry mesh, and then do one render and separate everything in Compositing? You could then pipe each combination into a File Output node OR you could render to MultiLayer EXR frame files and handle the layer separations in After Effects.