The mixer I have is a behringer eurorack mx802A. I was told what I was looking for in a mixer was “insert” inputs to reroute the channel out to the delta 1010. Something like this one I’m assuming
Soundcraft EPM6 8-channel Analog Mixer | Sweetwater
Hmm? Getting complicated innit? You really need a mixer with 8 mic inputs each with inserts. Even so you will need 8 cables with a TRS plug one end with tip and ring linked (to keep signal routed through the mixer) and TS at the 1010 end. I don't know if such cables are available 'off the shelf'? Custom jobs will be pricey. How's yer soldering?
The mix in the DAW then needs to come back to the mixer for monitoring, an FX return or stereo pair will suite for that.