Alas, there is a fairly big difference between Sevastopol and Malta. The biggest is that boats could sail from the Caucaus' ports and reach Sevastopol under cover of darkness. Secondly, Sevastopol is a fortress, with 'stockpiling' of supply. Attritional fighting doesnt take place, instead, you need planned assaults to attack the defenders, which means they donot expend much supply until the enemy attacks.
In my game (Trappenjagd) I ignored Sevastopol and its defenders. My opponent played fortifications card on the three hexes on the front line. After the fall of Kerch, I moved Manstien over and in ONE TURN, took the three front hexes and city hex, because he was so low on supply. Without using bombers, and without using any of the infantry involved in the Kerch battle. In fact, I probably didnt bomb either Sevastopol or his front line units once during the whole game.
His lack of supply was solely from the air interdiction from my airforce sitting on their airfields. So I think that some minimal supply should be in order....say a 25% level, or maybe even 50%.
My light reading on Sevastopol does show that supply did get through..for example:
On 15 June another 3,400 soldiers, 442 tons of ammunition, 30 tons of fuel and 12 tons of provisions reinforced the Soviets.
And it wasnt from lack of effort. The luftwaffe did try and did sink some ships in interdicting the port.
“My logisticians are a humorless lot … they know if my campaign fails, they are the first ones I will slay.” – Alexander the Great