Larian Studios Forums Divinity - Original Sin Divinity - Original Sin - General Pre-Purchase on Steam and get the Shaft?

I own the game on Early Access (was impatient yeah <.<) as well as ordered for the Collector's Edition recently. Would it be possible to let us say, tie the DLCs provided with CE to the current game at Steam? Or do we use one of the CE keys? Assuming their only difference would be the digital goodies, nothing more.