That could well be so, but from memory I am certain that the executive summary of the Anderson report states that the science is still unclear—or words to that effect.
Furthermore, the vaccination-to-live provision is already contained in the Bill. Clause 4(2) states:
"The Minister may cause to be slaughtered any animal to which this section applies".
"Shall" cause to be slaughtered is vaccination-to-kill, but the Minister "may" cause to be slaughtered; in other words, he can do so or not. Therefore, the power to vaccinate-to-live already exists.