I have always been intrigued by how authors can show “accents” through their writing. It’d be interesting to see if there are any websites at all that can help you do that. Thanks for asking that question.
One of my favorite authors, Diana Gabaldon, uses several different accents in her work, including Irish, and it remains easy to read. You might consider perusing one of her books. Most of them are Scottish, but there are a few Irish characters sprinkled in.
I haven’t looked for popular phrases so I have nothing to offer on that end of the spectrum.