No. The reason why John Cena's Dr. of Thuganomics gimmick worked out so well was because it was edgy and Paul Heyman was booking the character on Smackdown back in 2003 with Cena writing his own raps.
In today's WWE product full of shitty Hollywood writers and wrestlers having to have promos scripted for them, I can't see a rapper gimmick being that successful. They tried to do a rapper gimmick with Slam Master J (Jesse) but it failed miserably.
I'm fighting Sin Cara, the botch machine,
When you see blue lights, you know its him.
He's fighting in the dark to hide his botches,
he even botched sex, forgot to take off his clothes.
That's the first round knockout, you know that I'm not playin'.
You can botch all you want, it's your last year and you're not stayin'.
I actually thought about a gimmick but that wouldnt fit this pg era:
Think about snoopy dogg style gimmick, you know always stoned and act like a pimp every week change his vallet (can also be use to intreduce us new divas).
This can be pretty cool