Imran must ensure that the killers are brought to justice first. he must ensure that police, lawyers and judges don't face any intimidation or threats by TLP thugs.
Impossible. This ideology is woven deep into our society. Even the military can barely control it. Once al-Qaeda hijacked PNS Zufliqar by brainwashing 5 navy officers. They almost started firing missiles at USN but SSGN took the ship back. This was a long time ago and they're safeguards in place to prevent this now, but you get the point.
These mullahs have millions of followers and their own massive private militias. Provoking them will cause riots worst than East Pakistan.
Even your own security guard could kill you for being accused of blasphemy. It's happened in the past.
It will take decades of "de-radicalisation" programs to bring this extremist ideology to end.