Not sure what you are talking about doing? Are you wanting to buy both shafts to make your perfect 'Frankenstein' shaft? I would think you would have to in order to make this happen (OB isn't going to sell you their ferrules to put on a different shaft, I wouldn't think). Seems like a lot of trouble/expense for very minimal gain. And you would invalidate the warranty of both in the process, I'm sure.
Just get the OB if you like the hit better (I would agree, btw). The difference in deflection is negligible anyway.