Cool. I’ve used Blumlein with Omni outriggers to extend the angular pickup. Technically, it’s verboten when there’s audience applause you want to pick up on the back but since the back side of the Blumlein is inverted polarity but the omnis are not you’d think they wouldn’t mix well. But if you space the omnis wide enough the cancellations are vague and random enough so you still get a pretty specific stereo applause track! It can sound great. Use your ears and listen for anomalies muting and unmuting the supplementary omnis.