Nasr while it could raise the spector of nuclear exchange, babur is unlikely to do so. If you are suggesting that India will go nuclear with a CM launch from air (as i suggested off H-6K) It is unlikely. Any aircraft lifting off any regional airbase is tracked by both countries. You think that Pakistan is going hold back a conventional cruise missile launch cuz India may think its nuclear... Unlikey. They will use whatever means are available to defend themselves. Launching babur and ra'ad will be expected in any conflict. If they feel like they are facing a mortal risk of annihilation then they will risk going nuclear, so what you are sayin (missile launch will be perceived as nuclear strike) may be true but in any conflict those particular missiles will be launched. It is modern combat which is centered around these weapons.
@Tank131 I assume you have a military background, if not then, to quote John Travolta in Broken Arrow 'assumption is the mother of all fcuk ups' ...... anyways, assuming you as a professional soldier, would you, faced with an enemy who has a declared first use policy in both strategic and tactical environment, sit idly with multiple missiles heading your way? Honestly, if you would wait for multiple missiles to strike you and see if they are conventional or not, the game is up. Understand something about the dynamics of any future (improbable) conflict in Indian subcontinent. The nuclear threshold will be crossed, and will be maintained at low level. Both the countries are prepared for that and both the countries train their armies for that.
As for the bold underlined part, nope. The LRTR project of India "Swordfish" a derived project of Israeli Green Pine, has range in excess of 1500 kms. That covers the Pakistani airspace as the crow flies, from east to west. Additionally, the constellation of satellites in orbit put by India IRS series (remote sensing) and the dedicated military satellites are tasked for continuous watch over Pakistani airspace albeit in rotation. For India, the distance of bases off the border is sufficiently away for an aircraft to be airborne, refueled just outside the range of Pakistani radars and then commence hostile action, giving vital few minutes of advantage.
@MastanKhan has taken pains to explain these points, but I guess his efforts are in vain. A small example, in Kargil War, Pakistan decided to load one F-16 with a nuke, and immediately a call from Vajpayee went to Nawaz Sharief intimating if the aircraft takes to air, Indian nuclear strike will take place in 8 mins of lift off ......!
I have elucidated the Indian doctrine in related threads and will not indulge here as it will be off topic. However, knowing the scenario first hand, there is no way that any officer of Indian army will sit waiting for missiles to strike. If a solitary missile is fired, yes then they will sit and watch the effect, but that will negate the effect you have elucidated.
Just my 2 cents worth!