Here is how #Mecha Alfred plays into my version of Mecha Batman:
The Wayne family are benefactors of Justice Consortium. It's possible that Charles Wayne even helped in establishing them, however, their financial and scientific support is key to the Consortium. Wayne enterprises represents one of the flagship corporations that provides automatons, weapons, and materials to the Consortium. Thomas and Martha Wayne are inventors who specialize in developing Mecha Heroes to fight the Doom Legion. Ultimately, they are unable to conceive children. As such, Thomas throws himself into building a new Mech.
The mech he builds will become Batman, however, since to Thomas this is his life's work he calls him "Bruce" and for all intents and purposes he is the Wayne's son. Bruce is treated like Thomas' son and Thomas begins to raise him as he slowly completes his construction. In the midst of running diagnostics Thomas activates Bruce's vision and speech functions, but his body is inactive. Then the Doom Legion strikes against the Wayne Family. Bruce is unable to act in saving them but he witnesses their deaths first hand.
4LF-RED is there to prevent Bruce's capture and thus begins B4-TM4N's ascent to becoming the Dark Knight of the Mecha Universe. We learn that the Doom Legion actually sent a bomb to kill the Waynes; it is an exploding Teddy Bear that the Waynes purchase for Bruce. I bet you can guess who made the exploding bear? HA HA HA!