(I wrote an earlier reply to you, then deleted it, but keep on thinking about your post, so have come back to it. Please feel free to ignore me completely, but be sure that this brief comment is written with the very best of intentions.)
I (obviously) have no particular insight into your situation, but I can't help thinking that in the situation you describe, QR code ordering isn't the root cause of your stress, but is maybe triggering stress related to other issues within your group dynamic?
Consider a generic family group: in general, on most occasions, should they be able to work out how to order food together without too much stress being generated? I don't think that's an unreasonable expectation.
And if you're not able to do this, maybe it's time to both introspect and discuss (with your partner, and/or children?) why - and consider new approaches to the situation and the problem.
I (obviously) have no particular insight into your situation, but I can't help thinking that in the situation you describe, QR code ordering isn't the root cause of your stress, but is maybe triggering stress related to other issues within your group dynamic?
Consider a generic family group: in general, on most occasions, should they be able to work out how to order food together without too much stress being generated? I don't think that's an unreasonable expectation.
And if you're not able to do this, maybe it's time to both introspect and discuss (with your partner, and/or children?) why - and consider new approaches to the situation and the problem.