as i see it alistair, you are about as qualified to give piano lessons as anyone. you can actually explain what it is we are reading. sort of like a docent at an art museum. there are so many things that piano teacher's probably miss and wouldn't if they were composers. besides - you still have all your fingers. what's keeping you from taking a few piano lessons?perhaps we should start another thread 'best piano lesson of your life.'
just don't tell anyone - and i don't think that they'll really notice. unless you are fond of very wide chords and confounding pianists. but, sooner or later -these difficult pieces get turned into duets.
...Poor duck