Finbarr Dwyer used to play a B/C/C# three row, and doubtless others do, but the two row box is far more popular with Irish box players. It used to be B/C, but then C/C# and C#D became all the rage, and I expect D/Eb will be the thing next year...

I used to play B/C/C# and I expect I could still get a tune out of one, but I don't have one any more, so not much point in joining your list.

Anahata