I think you guys are on the wrong track. It's the rhythm of Irish that defines it. The quintessential sentence from the course so far for me is 'sabhalann an cailin an madra gach la' -- duh DAH duh duh DAH duh duh DAH duh duh DAH. It's like you are dancing a jig with your mouth.
I'm still not fully conversant with the Irish phonetic terminology, but that B is slender, isn't it? It is definitely palatalized, to use a term from my study of Slavic languages. Were I choosing now, I think I would want something with a [w] glide, like "cuireann" or even "Gaeilge" as pronounced in these recordings.
Yes, that B is slender (palatalized). The hard/soft contrast of Russian consonants is certainly similar to the broad/slender contrast of Irish consonants. There are some differences, though, e.g. the Russian soft S is a palatalized S, but the Irish slender S is an English “sh”.