currently the ALU has a separate instruction set from the main CPU, as is defined in the ISA document, because the ALU is basically just the v0.1 CPU repurposed and slightly redesigned to work as part of the system.
If you want to help, my email is "darcystabler@gmail.com", if you prefer a different form of communication, just tell me, im open to just about anything.
Sorry, I won't help but I know someone did make a 16bits cpu in Excel sheets without any VB !