I thought his shenanigans is more of a political blackmailing Ganjaa on gaining favours or settling some past grudge instead of change of heart for PTI-PAT.
They used to be, but at this point there are two things on his head.
First and foremost: the Scotland Yard noose closing in on him. He wants to get out of that net because that net he cannot change regardless of whether Karachi is brought to a total halt or not. Any actions taken while he is in country he can change with that.
Second, he wishes to hand over the leadership to a successor before he goes. This is to ensure the continiation of the party and not a tussle later. Basically, the idea is that this successor will be empowered by Big Bro himself before he conks out for good so to ensure a similar grip on the party later on.
Third, He also has ideas of grandeur in that he wishes to maintain his relevance on the greater political stage of Pakistan. Essentially he wants to taste the power of holding an office in the government of Pakistan before he goes.. as a self assuaging act.