Hoping to get controller support for MicroPython w/ LEGO Boost, RP2040js etc, I researched a bunch of Bluetooth BLE + C/Python links here: https://github.com/pybricks/support/issues/262#issuecomment-... :

> https://github.com/DJm00n/ControllersInfo: HID profiles for Xbox 360, Xbox One, PS4, PS5, Stadia, and Switch

> "HID over GATT Profile (HOGP) 1.0" https://www.bluetooth.org/docman/handlers/downloaddoc.ashx?d...

- [ ] MicroPython: wrap the Bluetooth HID over GATT Profile events and buttons

Perhaps your Dreamcast controller could do BLE and VMU wireless.