Riften is a town that seems not to care too much about politics as a whole, as long as you have the right connections or backing. If you had say Maven Black-Briar's support or alternatively, the Thieves Guild and Dark Brotherhood support, no one would dare speak against that person, Argonian or not, especially in Riften. I don't think it would make it difficult - not any more so than living in Riften already is for the people, you know?
Sent from my iPhone using Tapatalk