Give Genitours to Portuguese and Spanish?

Historically, Genitours (aka Jinetes) were used more by the Christian Iberians (Spanish and Portuguese) than by the Berbers, though the word does derive from the Berber "zenata." This is an inaccuracy that I'm sure bothers a fair few history buffs.

Balance-wise, the Portuguese and Spanish are not very powerful on land maps, where the Genitour has its use, so giving them Genitours would not make them OP.

So why not make the Genitour a limited/regional unit similar to Eagle Warriors and Steppe Lancers? The Berbers can keep their unique team bonus giving the Genitour to their teammates.