You are under many misconceptions, even about your own forces.
Just a few weeks PAF fighters flew right above IOK. India has nowhere near the amount of SAMs needed to cover all of Kashmir, let alone off of international border. You would literally need thousands of units.
No such thing as "cheap SAM" that is needed to target a high flying drone, you will also need search radar as well. You will thus need to spend, literally billions of dollars in new SAMs and search radars to counter a Chinese/Pak investment of less than $100 million. Not even India can afford to compete at that level.
To counter this you would need 50 Predator/Reaper drones. With equipment and going by price UK paid, it would cost India $65 million for 3 aircraft.