There’s a good chance I thought about doing it! I probably wanted to focus on making the variant I needed first. Feel free to email me so we can talk about making your ideal keyboard.
The boards are impressively cheap and it made sense to use one instead of embedding the IC in the Commander PCB. It makes it much easier / cheaper if you ever want to upgrade your Commander revision - you just move the Raspberry Pi to the new board.
Additionally, it makes the cost of the Commmander PCBs lower, which allows me to stock more of them.