Sub mix-adding inputs -compact-pedalboard

I’m looking for recommendations for a compact device to add more inputs. Ideally it would be small enough to live on a pedalboard and have 4 or more inputs including a pre amp for mic. I was thinking a headphone pre amp or an interface of some kind. Currently I’m using an 8 channel mackie with everything sending on aux 1 and coming back to an open channel. This works but the playback from the aeros gets lost because the input signal is doubled. And the board is too much to deal with when traveling.

Thanks in advance!

Thanks in advance!

This is small enough for a pedal board, and has 2 mic pre’s. Mackie has one that’s a little wider, and double the money.

I just found this. It’s coming out later this year. It seems like it would be a good match for the aeros.