Look mom, I made this.
The first release on printable for a MMDVM Dual HS enclosure that is meant to be used without a Raspberry Pi mounted to it but using via USB connection. That's how I do it - and mmdvmhost runs inside a container that I built on my Raspberry Pi next to the svxlink container for fm-funknetz. Nice.
https://www.printables.com/model/1381942-mmdvm-dual-hat-enclosure-for-usb-connection