Ya, but a Bherringer Noise Gate only has enough for 4 Channels anyway.
What i would do would be to use the 2 XLR Inputs on the VF-16 for a couple overheads, then I'd take those tracks and send them through the Mackie later on and EQ them, and record them to new tracks then replace the originals.
A couple extra steps, but the job gets done.
I can alsways take the recorded tracks and send them throught he Mackie and EQ them, re-record them as new tracks and replace the originals.
I've already spiced up some old drum tracks with this approach.