Wow, that's something if you and Katherine can agree on something.
There is definitely merit to the fly in a box plan. But actually.... Alaric said that Esther used my blood to make him into a vampire like she did with her family, that he'd live until my life was done so that he could take out the Originals.... add in the fact that the sacrifice was to ensure that hybrids could not be created because the blood of the doppelganger was needed to create them, I wonder if we could use that as a means to sever the connection?