That's such a great idea! How advanced was your playing back then? Not that I'd be able to do that now but I think I would at least entertain the idea later on.
You could perhaps give it a go if you wanted! The more complex works of Liszt and Rachmaninov would hardly be the first choice in that setting anyway, and I have come across some beautiful Grade 1 or 2 music that would definitely work well. Even pre Grade 1!! There's some lovely pieces, it doesn't need to be hard.
I discovered last time I popped into my nearest hospital that they now have a really ancient looking piano in the foyer with a sign on it saying please have a go … no idea whether it's in tune or not but I will try and pluck up courage to have a go. But if I do, I will practice three or four really easy pieces for starters so there's less to go wrong. My Grade 7 efforts will have to wait until I am much, much braver!!!
As someone above mentioned quantity over quality in this case, I am yet to build a solid performance-ready repertoire (I think I'd be comfortable performing only a handful of pieces right now) but I do agree that sounding 'nice enough' doesn't have to equate to 'advanced' or 'complex'.
You should definitely give it a go, EllieD! I think people would be amazed by your skills!