Developing Brahmos like solution needs almost whole new line of R&D infrastructure that may be really expensive for Pakistan so clearly a no go.
From this stand off;
We can conclude that Pakistan has done quite good against brahmos.
According to
@Oscar ,Pak achieved almost 66% interception rate against Brahmos.
From OSINTs,
One brahmos was intercepted through Hard kill over Jacobabad.
Second one through hard kill near Shorkot
One crashed near Sundar Industrial State - soft kill
One crashed in Jay Singh Wala village
So Brahmos is not something out of this world that can't be intercepted.It can be and Pakistan has demonstrated this capability though thicker AD network is required to thwart Saturation Attack.
Our problem is not Brahmos.It's Saturation Attack where we struggle.
Our way forward is to increase the production of Fatah series missiles.If you look at the angle of attack of these missiles, it's almost 45 degree.That's clear indication that our missiles are following depressed trajectory.There may be room for further refinement and that's where our focus should be instead of opening Pandora box of whole lot of new complexities.