Could Pakistan army get some kind of constitutional cover for its constant meddling in civilian matters? If it cannot, then civil-military relations would remain a mess.
The cover is not necessary, they will never openly interfere. Gone are the days that they could march into power, seize PTV etc. Back then, the constitution didn't matter, you walk in and suspend it.
As for the cover, who needs that when you get others to do your work for you? The government itself, bureaucracy, the media, even the courts can be enticed, strong-armed, or manipulated.
If the army wanted to overthrow IK, it would be pretty easy, no need to do anything that might expose themselves. A few phone calls to their stooges within the PTI ranks, to the PMLQ and MQM, and the government would fall via parliament pretty easily. What prevents them is two things... the first is that they have no alternative to IK, in the past they picked favourites between BB and NS, remove one, install the other, today it's either NS (unthinkable), or PPP (too weak). The second problem is the backlash, if IK goes, he wont go quietly, he won't even go as meekly as NS and others, he'll do them reputational damage as he is still a popular populist leader.