If you want Ra'am's majordomo to have arrived last week, (March 7th or whenever), that's fine by me. How's this?
We'll say that Jaime Lannister was too despondent and wrapped up in his grief to see the majordomo, and the introduction got lost. After a few days of this, the majordomo returned to meet up with the caravan, and you all arrive together.
To keep matters simple, if you want to join in immediately, arrive in the A Merchant Arrives thread, shortly after Abdul arrives. We still need your backstory, though. If he's Iberian, what covenant did he come from? One from the list, or something to be added? Why is the full membership offer tempting to him?