The problem with using multiple 5000 pound bombs instead of the single, specialized, design to do this, 30,000 pound bomb is: you need to ABSOLUTELY control that airspace for a not insignificant period of time. And the more you need to use, the longer you need to hold it, dirt and sky.
No ground troops, no anti-air, no nothing: Just so you can convoy in a series of fat, slow, heavy precision bombers.
You've now hit the point where, tactically, to minimize risk: you break out a nuke and just use a tactical weapon.
Which means you're well past the point that literally any other strategy would work, like actual regime change (as opposed to a regime "refresh" which is what you would get if you just ******* bomb the jive out of them.). A big enough strike, nuclear or non, is going to cause the population to rally around their government, regardless of how much they actually like their government. They will take the devil they know if it means they get back to whatever passes for stability.