Those mnemonics are more a joke than anything else. Unless you already know what they're referring to, you can't make use of them.

You just need to listen to tunes in all those rhythms.

Bluegrass is a bit different from the others, in that you can get the same tune played at very different speeds - hardly anybody uses bluegrass for dancing so there isn't an imperative to maintain consistent speed. Some players like to show off by going as fast as humanly possible. To a lesser extent that also happens a bit in Irish music.

Listening to old recordings from performers who played for dancing will tell you what the original tempi and rhythms were. If you need metronome marks, you can calculate them from recorded performances the way I just did for that hornpipe - I've never found it easy to synchronize a metronome to a running piece of music.

                    number of bars in the tune * number of beats in the bar
  Speed in bpm  =   -------------------------------------------------------
                               duration of the tune in minutes