Well, I'm going to drop this issue untill I see how is PDX actually gonna handle this, but just so you know where I'm coming from, my point is that there was never such thing as a visigoth culture in the Iberian peninsula, they ruled, yeah, for three centuries, and the only remains from them are in Toledo, their capital and some scattered churches and public buildings in important cities of the time. The architecture of which, by the way, is mainly a continuation of roman engineering. Their cultural importance is zero, much less than that of the Normans in England, and you don't see England painted in Norman culture after Hastings.
If you want an iberian culture capable of breaking into Portuguese, (Leonese), Castillian, (Aragonese) and Catalan, then Hispanic would be a better choice. Although I do concede that there's no perfect choice to be made here, all have drawbacks.