Don't want to be negative but I think thats' a crazy strategy even if find an Irish financial institution to give u the loan.
I know the Euro/Aud interest rate differenial is 3.25% at moment but u are opening yourself up to exchange rate risk plus currency conversion costs( could be 1% or more when converting euro loan to Aud and vice versa when making monthly payments).
I migrated to sydney from Ireland in 2003 and have bought 2 properties with LTV 75% in 2006(both financed locally in Aud)
I never considered taking an Euro loan for above purchases due to reasons above and if I was to do it,would borrow in yen where interest rates are 0.5%.
Also bear in mind that latest comments from ECB are bearish whilst rates in Australia are forecast to come down in 2009.