Technically, you could... But people are having problems getting a single turbo working on the RX8, so I wouldn't count on it being cheap, as it'd be all custom... The two rotors would probably have to be split up, exhaust-wise, to two GT15's, or other really small turbos, as each rotor only puts out about the equivilant of a 1.3L 3 cylinder engine.
So, yes, you can... But not cheaply or easily.