How about we write something realistic shall we? Mirages are 50 year old platform, their airframes aren't worthy of extreme flight and maneuvers due to 40+ years of flying stress. The payload is very limited. I know the concept behind ROSE. But, that was when the PAF had nothing else besides some 1970's F-16's, some Mig-19 replicas (F-7 and A-5) and obviously, 1960's Mirages. So it made sense to do the ROSE upgrades.
Today, you have the JFT which by far, is the most superior platform second to F-16 that the PAF's ever operated. And you own it too. I think a J-17-S or strike variant is needed to replace the Mirages. Even in Multirole capabilities, the loadout isn't that impressive (at 4 tons including additional fuel). So Mirages may be good to provide close air / ground support with limited weapons. Sending these across the border would be suicidal as there is layers of Radar and SAM coverage. Specially around the flat lands of Punjab on both sides, which is where Mirages were going to get used, in addition to the Sea. The Sea role is also limited due to limited weapons load-out and airframe / fuel limitations.
Now, you compared "old" USAF tactics against the Viets. I am sorry, Vietnam didn't really have an airforce. Hot air-baloons, if they could fly faster could also have done the work. Vietnam and India are two VERY different animals. I think we can send our old F-4's and F-5's out of Aramark today and can send them over. But I can guarantee you, they will patrol the entire Vietnam and will come back. I don't think you can make that statement about even the advance F-16's going to India and coming back without harm. So if you want to do comparisons, give me something that even sounds similar. Let alone being Apples to Apples. Thanks