The badge does have two inputs and two outputs, which can be seen as 0-3V Audio. So convert this to some more Eurorack compatible Levels (still not sure what are the right levels) and make them available on some 3.5mm audio jacks.  Than you need some cariiere to mount the Badge in your rack. This is what I cam up with:

Front view of Carrier with four audio Jacks mounting for the badge. And a extended USB for update an other stuff. The USB extender is planed to be this: https://www.adafruit.com/product/3258
On the back: Space for all the needed cables, some LDO module (front blue one) and a prototype PCB. On the Prototype PCB will be space for the eurorack power connector and some circuits for the level adjustment. The Badge will get powered via the LDO form the eurorack power. To connect the Power the SAO-Header on the Top will get used. The goal is not so change or solder anything to the badge itself.