Custom Mixer - 12 Stereo Channels

Is there a way to customize the I/O of the pre-built mixers? I would like a
12 stereo that can also be changed to 6 mono IN.
Yes, I realize 10 Gain and balance mono to stereo will do the job but then it’s not a single block.

Are you looking for 6 Mono ins….each going to a Stereo out?

6 mono IN / 6 mono OUT, in one Mixer block would be nice.