I strongly recommend Digvijay Singh who can create umpteen number of controversies in side the house and also shall be a great entertainer through out. To match him Baba Ramdev also could be considered inside the house to teach yogas to inmates.
Instead of hiring few actor why not Bigboss handshake with GOI for Tihar Jail and they can get kalmadi,Raja,knimozi....and so on free of cost and we can see real drama