Good suggestions and ideally I would agree. But it is my assumption this will not work. In fact, it will more or less be non-starter.
1. No Afghan will agree to this. Its a death nail for them. Previous Taliban regime (the actual one) just left it at status quo with no fuss. But then the border was open and virtually meaningless, at least for them.
2. Ideally yes - not only removed and disassembled but extradited for their crimes. However, making any distinction between TTA and TTP, despite seemingly separate command chain, would be foolish. They are same.
Additionally, with Taliban appeasing India and latter planning to reopen its Afghanistan mission, Pakistan's concerns are no longer limited to the above two issues. Without forcing Taliban to subject their foreign and security policies to Pakistan's assent we'll not be able to stabilize our Wild Wild West.