Why are you sure about the SFC not having any dedicated mki squadrons. Before the induction of A3 the only way to reach Beijing was an mki. It still is our longest range strategic aircraft/bomber.
MKI can't reach Beiijing. Even if it did, it would be a suicide mission where the pilots will have to bail once they reach the target. Even with 1000Km Nirbhay, the chances for returning are low. Chances are slightly increased with drop tanks if we consider the MKIs head straight to the target and do not deviate from course to confuse the enemy, but we don't have any drop tanks. Mid air refueling is impossible.
MKI won't reach Beijing even during peace time, let alone during a war. Combat radius for an MKI with minimum load is 1500Km.
Only A3 and higher can reach Beijing.
SFC has only formally requested for 2 squadrons, that does not mean they will get it. There is a lot of turf war involved. IAF wants SFC to deploy IAF assets during times of war. There is a chance IAF may purchase more MKIs and give it to SFC only during times of war, at the time it goes nuclear, instead of letting SFC gain control over 2 squadrons for their own use. The priority for today is Air force first and Navy next. The Navy's deal alone will be in the 2020 period because that's around when the 3rd Carrier will function, so they may receive aircraft a year or two earlier to the date INS Vishaal will be ready. SFC's chance will come beyond that.