try it if you want. Personally, i'd probably run the octava's>mp2>d7 if thats what you have to work with. But if you are 2nd row in the center, they will shut down your stand unless you run it at head height. So from that position you might almost have to do the SP>BBox>D7 it is possible to run a 4 mic mix, if you use your SP omni's i'd space them or a j disc, then run maybe an ORTF with the mc012's, run them both into the mixpad > MP2 > D7. That would work, and it would be interesting to hear the results.