If you assign those channels to a group/mix and record that instead of the seperate channels you’d be done. Unassign the channels / assign the group/mix in the usb routing page.
However: since most daw’s can record much more channels than 16 why would you want to do that ? If need be you can always group several inputs in the daw after the recording.
I record a lot and the track count is starting to really eat into the storage over the years, and if I get it sounding good at the source (like I usually do) I never touch the snare bottom track. Kick in and out too: get it right, commit to one track. Yeah, I could render in the DAW, but why bother.