Sorry but I'm still thrashing out the question of keyboard layouts for Irish-style boxes in my mind. Recently I wondered why on earth makers don't do 21 button keyboards with a longer inner row - see the earlier thread.
Having just heard from a couple of makers whose work interests me that they can't reverse the rows with their current designs, the thought hit me that, for C#/D players, a conventional 21-button layout would be absolutely fine, as long as you had the "doh" (D on the inner row, and C# on the outer row) on the fourth button rather than the third.
You would lose the top two buttons of the normal 23-button layout, but 3 out of the four notes these buttons sound are useless anyway. You'd lose your top C# on the inner row but you'd still have one on the outer row. And you'd still have your top C-natural on the outer row. And at the bottom end you'd have low D and, more importantly, low G.
I can't see what's wrong with this picture. Can anyone? I think I'm on the road to a more compact box...