Good advice from John. Clarinet is very unusual in the Irish-style sessions, but less so in English repertoire, as it was often used, along with bassoon and cello, in the old village bands. Sax ought to be easier; you can get little ones nowadays, I believe, which finger more like whistles and have a smaller sound, blending better with the other typical instruments. I've heard them played occasionally and thought they worked nicely, but unfortunately can't give details. I expect someone else will know.