Couple things: your name needs to match the bike ownership documents, but your nationality doesn't matter. You can carry (and use) both passports if you want--there are a few places in South America which are cheaper as an Irish national. You don't need a carnet anywhere in the Americas, so skip that whole step unless you're looking for ways to shovel money out of your life (in which case I can offer you a place to do so on your ride south).
As a friendly suggestion: brief, concise questions tend to attract answers. Rambling posts full of rambling queries (like your other post) tend to attract, at best, answers which have no bearing on what you're trying to find out. As you might have noticed.
Hope that's helpful.
Mark
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