Hey,
I don't think I'll deliver this,
The recipe of an item is selected according it's recycling recipe so all recipe ingredients outputs are used in the assembler and will not overflow in the belt,
For example with the Pipe To Ground the recycling recipe produces Iron Plates and Pipes,
If we do the Upcycler Loop using with the Casting Recipe the Recyclers would be outputting Iron Plates that would never be used by the foundry,
So we would need to handle those cases, in modded recipes it could be more problematic,
I'll drop this idea for now, at least it's not part of my plans to a finished version of this mod (1.0)