The invasion of the Muslim in 711 and the conquest of the Peninsula meant that OTL the development of the Spanish romance languages took place not in the most populated regions of the south or in the traditional Visigothic capital of Toledo, but in the more mountainous, less densely populated regions of Northern Spain and in particular in the case of OTL Spanish this meant it was heavily influenced by Basque, a language spoken by a people that had been an outlier in the Visigothic kingdom.
So now, and while I know there have been a couple of threads that have touched upon this, I was wondering how that Spanish might look/sound like. I suspect that some obvious things would disappear like f- > h- and perhaps the development of a seven vowel system similar to that of Italian or Catalan as opposed to the modern five vowel system of Spanish and hence less diphthongs in the language? Obviously there'd be a lot less Arabic influence in words, although I suppose this will mostly affect the realm of agricultural terms. What might be a good reference for how the phonetic system would evolve further south? Perhaps Mozarabic?