Irish schools are just as hard to get into as many U.S. med schools (probably selectively on par with good D.O schools). Australian schools love international full fee paying tuition dollars (you pay a lot more than the domestic students) and therefore they are much easier to get into for internationals. That being said, you would be hard pressed getting into even Australian schools with a 494 MCAT and you can forget about Ireland with an MCAT that low. Australian and Irish schools weigh the MCAT most heavily because it is the easiest way to compare applicants. To compare your MCAT score to some Australian schools. UQ requires a minimum 496 and Sydney requires a minimum 500 for an interview for internationals.
I've lurked around these boards for a long time when I was a premed and I couldn't be happier with my decision to go Australia over the caribbean. I'm in the UQ-Ochsner program which guarantees 3rd and 4th year rotation sites in the U.S. at Ochsner health system in New Orleans. The match rate is around 93% while step 1 scores are still slightly below the U.S. average but improving I think. The admissions criteria is selectively on par with schools like SGU (B average gpa, 26 minimum mcat to apply) so I could never understand why more people didn't look into the program (Altho in recent years it has become a bit more competitive, last year was the first year they did interviews, minimum mcat just increased a bit as well from 24 to 26 on old MCAT and 499 on new as of last year). Even so, the class fills several months before the start of term. And there are plenty of kids in my class who had offers to DO schools and came here instead to end up as IMGs. Honestly its great being in classes with some of the best and brightest in Australia and the U.S. and Canadian students are no slouches either.
That all being said, I have plenty of friends that did the carib option successfully and I respect anyone that went through it, but it just wasn't for me. I didn't think I would do well in that cutthroat attrition heavy environment with those huge classes. Happy I came here instead! Not saying I will definitely be successful, I'm only a second term student but I like it so far. I urge you to look at Australian schools as well as carib schools. I had very mediocre stats and I got into 3 Australian schools 2 of which are ranked in the top 50 worldwide