That Zoom mixer is actually quite intriguing as it has enough channels to be used in my little studio. The lack of AUX sends was a bit offputting at first, but I reached out to Zoom to check if the 5 headphone outs could be used as sends, and their answer was:
[…] Each headphone output has an individually adjustable mix, so you could use them as aux sends. […]
This could work really well with my incoming 5x5 matrix mixer.