I agree it is better to think of it as an expansion of 3 time, rather than 9 individual notes. I play bodhran and cheat a bit with some tunes where it's e.g 123/223/3-3 so you can play dud/udu/d-u and therefore start each new bar with a downstroke. This works for the first half of Drops of Brandy, but in the second half you have the full 123/223/323 so you just have to get your upstroke as convincing as the downstroke and still try to accentuate the first note of each bar, whether it's down or up ......if you get my drift!!??