You've already shelled out big bucks for the Bryston combo. It would cost you a fraction of that to try the alternative. Go ahead and try. If it compares well to the Bryston then send the Bryston back or resell it.
If you prefer the Bryston then you can use the HD with either it or the Oppo.
If you prefer the Bryston then you can use the HD with either it or the Oppo.