What class of travel? using Qantas points, I believe that you are looking at about 186,800 r.t in business class plus USD1600 ias a fare disguised as taxes ( surcharge) plus USD164 in taxes

If you were to transfer points to AA and travel on AA , you would be looking at 115,000 points plus USD164

various airlines have fares from CID-DUB r/t for $3250 r/t inc taxes . You would be getting $1,460 value for 186,800 poimts which requires 374,000 Amex points ( if using Ascent Premium )

You could transfer 427.500 Amex points to Marriott Bonvoy and which would give you 327,500 Bonvoy points, which coiuld then be transferred to AA to give 115,000 points

If booking business class, would suggest this as a better value - 43,500 extra MR points to avoid the $1600 co-pay