From your answers Lounge access is one of your priorities. if I were you my strategy would be the following.

Chamge to to the new Vueling Program you will have the status in the airline you fly the most -have not look at the program in detail. Get AVIOS that you will be able to transfer to your IBERIA PLUS account via AVIOS.COM.

Get the new Iberia ICON card and you will have SILVER status with IBERIA PLUS

For lounge access get Priority Pass directly -cheaper than having the AMEX Platinum card.

Those se are my two cents on your strategy. In my case just switched to BAEC and the Iberia Icon. My travel patterns are on J fares and what I value the most is being EMERALD on ONEWOLD and able to redeem premium fares on IB Plus. Plus pool AVIOS for redemption from two accounts as there are two of us with the same travel patterns.

Best, JC.

BTW where in BCN are you Barcelona and Sitges here.