In most of the places that Sefardim settled after being kicked out of Iberia, there were already Jews living there, usually called "Musta'arabi". In most places, these communities intermingled to create the communities usually called "Mizrachi" today, but in some places, the two groups remained separate. I know this to be true in a few places, notably Morocco, Malabar in India, and Tunisia. In Morocco, the non-Sephardim are known as "Toshavim", and they have their own Nusach. In Malabar, the non-Sephardim are known as "Cochinim", and they, too, have their own Nusach. In Tunisia, these Musta'arabim are called "Twansa", but I can't find any information as to what Nusach they use. Did they use the same Musta'arabi rite as the Toshavim? Did they use Edot Hamizrach even though they were distinct from the Sephardim? Did they have their own Nusach? If the latter, where might I be able to find information on this Nusach or perhaps even find a siddur?