Render object in predefined order

Hello,

I try to implement my custom shader technique; In order to get it works, every objects in the scene must be preprocessed in this way: object geometry is split in two part, one part (let's called A) has its own shader, vertex/index buffers, primitivetopology, also the other part (let's called B) has its own shader, buffers.

Now, to apply this technique correctly, I have to render A first and the B in this order. This must be done for every objects so, for example, if I have 3 objects in scene I have to render: A1 B1 A2 B2 A3 B3.
How could manage this in Helix? I think about create two nodes (one for A and one for B) and append both as child of an "empty" parent-Object node