Cannot offer you any specific advice on Killarney. I do know that some bars in Kenmare have foreign beers. I think a bar called Mulcahy's has Krombacher on draught - at least it had last year anwyay! I think the bar in Sneem is O'Shea's though I have never been there..
I think I would venture to some bar and try some of the old reliables rather than sticking to the confines of your hotel room for the evening - that is of course unless you specifically want to be in the room all evening!!!!!! Have a nice time anyway,
P.S. - I strongly recommend the Old Rectory Restaurant across from Catholic Cathedral - very nice place with great food and very welcoming and most professional host.