This is in a way minimal and in a way not, but maybe worth mentioning here…
I’m slowly getting into the AE Modular format, and it occurs to me that these days the format has quite a few different kinds of mixer modules. People looking for a ‘minimal’ mixer probably don’t want to get into a whole new format, especially one that uses little dupont-style patchwires, but on the other hand you could design some very specialist mixer applications with a small footprint and for not much money. And powerable from a portable USB phone charger.
I did a mock-up on ModularGrid and came up with 13 channels (7 knobs and 6 faders), 6 minijack send/returns, 3 inbuilt FX and a 3 channel matrix mixer for 400 euros including case. Seems like a good time to me!