Helmut Walcha recorded the complete organ music of Bach and he was totally blind. I don't see a problem.

Played it in a session last night - a fiddler started it and I joined in on a recorder; turned out I could remember it better even though it's been a few years since I last played it. Memorable tune, and if it's a bit of an outlier in Carolan's output, I don't see why he couldn't have tried a bit of genre-bending in a culture where Italian Baroque music was fairly well known.