Have you looked at the third party app, Mixing Station? I know on the Avantis and DLive, you have “solo” functionality available on the app. I don’t know if the SQ has a different limitation that would prevent it from working however.
I personally use a spare IEM transmitter and bodypack for PAFL at the church I attend because the console itself is located in a balcony outside of the speaker’s coverage area. I’d rather sit in the congregation and hear direct sound from the speakers vs sitting at the balcony and only hearing sounds that are reflected before they get to that location.