I want to say something controversial but what I think is apparent.
Balochs from the very first day have been heavily pro-independence but even Pashtuns and Punjabis are not a compatible ethnic group tbh. From a historical, social, culture, ethnic perspective they have never had good ties and if anything viewed each other negatively. At least the Pashtuns have of Punjabis.
You could give them equal rights, which you have given their disproportionate representation, but a large section of them will never want to accept a country of majority Punjabis, they are by nature dominant if you see Afghanistan or their own localities.
Now you are going to war against a country that's seen as Pashtun-dominant which will cause a bigger split in opinion.
If we are brutally honest, they have never had good opinions or thoughts of Punjabis in the way Punjabis like to suck up to them. And the tensions will grow with Afghan intrusions and Indian support. Outside the defence nerds, do you expect tribals and normies to side with Pakistan or Pashtun-run Afghanistan?