That's your second question. Let me answer this one.
In the way in which governments proclaim legislation, as members of the committee will know better than myself, they can proclaim different sections at different times of any law and bring it into effect. There would have to be a managed phase-out for what SIRC now does, there would have to be a managed phase-out for the civilian oversight of the RCMP, all of which could be part of a two- or three-year transition process, but in the end, there would be one committee of parliamentarians with substantial resources.
By the way, the British model sadly makes the case that if you do get asked by the Prime Minister to sit on that committee, you're not going to have a lot of time for other parliamentary duties.