@darcagn heard back from him already Here's his response:
I sent him photos of the dreamcast serial port and a homebrew sd card adaptor I bought from eBay as examples, and asked if it was something he could do (or if not, could he refer me to someone he knows that can), and I would just need to know what the minimum order size was and a rough cost estimate to see if it was feasible. I'll post again when I know more, also feel free to PM me if you want (I'm also on Discord, same username).
He asked me to write a formal product request so that he could forward it to potential manufacturers, so I'm getting more info on that now.
Interesting! Let me take a close look. Basically, it is not hard to customize a cable with connectors. I have done a few power supply cable customizations for other tablet projects.
I sent him photos of the dreamcast serial port and a homebrew sd card adaptor I bought from eBay as examples, and asked if it was something he could do (or if not, could he refer me to someone he knows that can), and I would just need to know what the minimum order size was and a rough cost estimate to see if it was feasible. I'll post again when I know more, also feel free to PM me if you want (I'm also on Discord, same username).
He asked me to write a formal product request so that he could forward it to potential manufacturers, so I'm getting more info on that now.