Wonderful discussion, as always. I think the wide card included in that V1 package could come in really handy for these type of situations, so that other set of amplifiers could really come in handy. Best thing about OMT is you can use or not use or mix in at different levels whatever you want.
Just another note on the omnis, I believe the OM1s are flat out to 20khz, so you might want to give them a little boost beginning from 3.5 khz or so in your mixdown if they sound too distant.