I don't get it about all this no fly and military stuff.
Me neither, should not be that difficult to ground G air capacities once and for ever, with or without security council permission.

Do the math. Two million or so folks in Tripoli, a large metropolitan city which has no indigenous food/water supply.

Two million people need how much food, water, medical supplies, on a daily basis, to be happy and productive?

International assets are already frozen, and could, for example, be earmarked for humanitarian relief to the east (but not to the west), so trade, and especially new weapons, will be chaotic at best, begging the question of whether even a naval blockade is critical. If no access to global credit, what shipments need to be intercepted?
Apparently, G can leave decades without receiving external support. The questio is rather how long it will take for them to get weak enough to flip the coin of popular support. In fact it can take ages especially as you cannot have a official blocus on basic life saving items as food and water.