Hmm... The machine you seek... is not Factorization's Mixer. It takes time and (free) energy, only to combine the Alkahest with one cobble at a time.
*testing*
Neither is AE, the ACTII, the Liquicrafter, BC's ACT, the Cyclic Assembler, or the Craftpacket system.
Mod request: An autocrafter that understands both recipes including stacks of items, and can catch items dropped into the player's inventory upon crafting.
But then again, how OP would generating redstone from stacks of cobblestone be?
Edit: Blarg, ninja'd...