hola,
this topic has been covered many times in the spanish forum. the irish IAA or british CAA are much better, but I think you need to live there or at least to be employed by a british or irish company in order to convert your licence.
Anyway even if your company is portuguese, dutch, german or whatever try to convert your licence anywhere you can, the spanish DGAC is more like a joke.
With a spanish licence you would need to call a spanish TRE to unfreeze your atpl, otherwise it wont be accepted.
Be patient for the licence convertion, the spanish DGAC is slow
