Even though Pakistan had F16..they were just vintage pride as show gear..the Israelis had very advance air defense system plus air force jets..and Pakistani attack would have been neutralized long before it entered Israeli air space..actually far better than F16 in this scenario would be large numbers of F7PG on full throttle taking off from a friendly country located near Israel as they are a mach 2.3 capable aircraft and have better chances of evading air defense system or chasing aircraft.
But wether the Israeli attack Pakistan or vise versa one cannot escape the geographical facts..
There is no direct air corridor between Pakistan and Israel and the air route would transverse several countries which must accord military mission over flight rights to IAF and PAF before any mission can be carried forward.
The total line of sight distance between Karachi and Tel Aviv is 3245 KMS and the maximum ferry range of different air crafts with maximum drop tanks is
F7 = 2,000km
F16 = 4,220 km
F-15 Eagle = 5552.237
Pakistan does not have F15 and Pakistan F16 at that time were also range limited...we only started getting drop tanks for F16 recently...Therefore hypothetically speaking...even if Indian begged Israel to use its soil..such an attack was infinite impossibility without tactical approval and support of USA...and USA would not need Israeli action to take out Pakistani reactors. ...