Remember that in the Freelancer universe the Molly movement originated as a worker's protest consisting of ex-BMM and other workers that got pissed at how Bretonia is treating the gold fields of the Dublin system.
It has more to do with worker's rights and space resources than it has to do with nationality and culture.
Although inspired by the real life IRA which sees the British presence in northern Ireland as an occupational force, they were never meant to be the same thing, in game, the Molly movement doesn't consist of Irish people necessarily, but of all people employed by the Bretonian corporations and whoever else the Mollys welcomed into the fold.
With that being being said, my personal suggestion which you can ignore is to change the faction's symbol from the Irish Harp to maybe a sci-fi version of the Celtic Knot if you wish to maintain that Irish style.
Or at the very least, modify the Irish Harp to look like something closer to the Freelancer universe because right now it's just the symbol of the nation as it exists in real life and that's sort of eh, the closest "import" of real life symbolism in Freelancer is I guess the flag of Bretonia which is just the Union Jack, but made into a "V" type of shape instead of the square flag, so maybe do something similar with the Harp?