Since {po'onai} is to mean "not-only", I think that the corresponding
one for "except" should be {ji'anai}. Thus we'd have:
po'o: this one and no other (only)
po'onai: this one and also others (not-only)
ji'a: others and also this one (also)
ji'anai: others but not this one (except)
la'e di'u nalvajni lei ji'anai se gugdrxeire
That's irrelevant except to the Irish.
i pe'ipei?
Jorge