The Gifted roles would just be known by the Downer name rather than their traditional one. In other words, when someone accuses someone of being the Cobbler, they accuse them of being 'Rimbaud.'
And yes, you would choose another Barrow-Downer in place of what is sometimes known as your 'occupation,' and try to play and post as he/she would. And you would be known as that Barrow-Downer throughout the game.
So if I picked
lmp, then I would try and post as he would and play the game as he would. Also, everyone would refer to me as
lmp. At least, as long as they thought I was really who I said I was, and innocent.
Perhaps when someome suspects you of being a wolf, they should say that you are not 'insert chosen Barrow-Downer occupation here,' you're 'insert your Barrow-Downs screenname here.' Because you are obviously not who you say you are.
In other words, if I chose
lmp as my role and someone accused me of being a wolf, they would say I was acting rather 'Durelinish.'
Okay, so basically my ideas serve only one purpose: trying to make things more confusing.