Let's say Afghan government accepts Durand line. What would Afghanistan get in return? Can Pakistan gaurantee that it's soil won't be used as a base by invaders to attack Afghanistan? Pakistan provided full support to the 2001 invasion of Afghanistan, it gave it's air bases like Shamsi air base and provided the transit routes for the invading forces to make sure the occupation of Afghanistan goes smoothly. Without Pakistani support the occupation forces wouldn't have stayed as long as they have done. I don't think that's too much to ask is it?
I have no issue with a reciprocal commitment from Pakistan to not interfere in Afghanistan. Please remember that it was Afghanistan that started this business of supporting proxies decades ago, both with support for insurgents in the Tribal Areas and sheltering Baloch terrorists, long before the Soviets came.
Perhaps a joint Presidential and Parliamentary statement with commitments from both sides. My concern is that without regular Afghan's first strongly speaking out in favor of accepting the Afghan-Pakistan border as is, the Afghan government will not be able to make such a move, hence my suggestion that we need more and more Afghans speaking out on this issue to help the two countries move forward.
The PTM is a grass roots Pakistani movement by disgruntled Pakistani citizens who were simply not happy with the way the state handled their demands for missing persons. The movement has nothing to do with NDS and RAW. NDS and RAW may have tried to hijack the movement and use it for their own advantage but it doesn't discredit the movement itself and it's original cause. Similar to the Taliban movement, it started due to power vaccum in Afghanistan and Pakistan simply supported it. Doesn't mean it's a Pakistani movement. Pashtuns on both sides will always stand up for each other and speak against injustice. It's only natural.
I disagree with your characterization of the PTM, but that aside, the Afghan government and government officials should not be engaging with a racist and ethnic hatred promoting group in Pakistan. So long as the Afghan government keeps issuing statements in support of the PTM and inviting PTM leaders to Afghanistan, the only conclusion that can be drawn is that Afghanistan supports the PTM's racist and ethnically divisive rhetoric and therefore supports organizations that want to divide Pakistan - there cannot be peace between our nations with the pursuit of such policies by Afghanistan.
I agree that we should stop claims on each other's territory. The land belongs to the people who live there. It shouldn't be seen as Afghan or Pakistani land. The prosperity in all spheres of life should be the primary objective. It doesn't matter what state it falls under.
The land belongs to the people and the people have chosen Pakistan. Borders exist for a reason and they must be respected and Afghanistan needs to end its claims on Pakistani territory and accept the Durand Line as the border like the rest of the international community.
My ideal scenario for my Pashtun people would be that my language Pashto becomes the primary means of communication in all spheres of life. I want to see scientific books published in Pashto. I want Pashtun kids to get their education in their mother tongue. Scientific research shows that kids learn better in their mother tongue especially when starting out. In Afghanistan, that's already the case in Pashtun areas but still more needs to be done. In Farah province which is 80% Pashtun, the medium is still Farsi. In KPK the situation is really bad. The medium of education is in Urdu and English. Pashto has been relegated to a spoken language. A language can't thrive unless it is being actively usdd in all spheres of life. I am sure it's the same with other regional languages of Pakistan. It's a shame that speaking regional languages has become a sign of backwardness and lack of education.
Supporting the growth of regional languages is something that should be encouraged, whether it is Punjabi, Pashto, Sindhi etc. You are correct that every regional language has seen a decline in Pakistan and most parts of Pakistan teach in Urdu & English. The 18th amendment passed almost 10 years ago made education a provincial subject, so the provinces could make a move to introduce regional languages, but honestly, with the diversity in Pakistan, that will likely make things a lot worse before they get better at this point. There aren't enough qualified teachers that can teach in Urdu and English, shifting to teaching in regional languages will likely make that pool even smaller.
There is an additional wrinkle in that a ethnically and linguistically diverse country, where residents from the various provinces travel, work and live in other provinces, needs at least one common language of communication, so limiting education to just regional languages isn't going to work. Think about how many Pashtun, Punjabis, Urdu speakers and Sindhis live in Karachi or Lahore for example - what language will they be taught in?
Like I said, while promoting regional languages is absolutely a desirable goal, I don't see it as very practical at this point.