Hi guys,
Yep, I thought about Toppobrillo's Stereomix or Happy Nerding's PanMix. The last one is produced by my friend from a neighboring town, so I can try it first. Also there is a smaller version PanMix Jr without cv controls, but a very cool for tiny cases.
Actually, now I've sold that small case from videos above and bought two cases: 104x2 for studio and 70x1 for travelling around. Many plans for future videos, hope that all this nightmare that is happening in the world will end soon.
Wish you all stay healthy! Cheers!