Youre assuming ALL 80 Jugg's are gonna come out of the hump node at once.
You're assuming that the Shivans are stupid. They're not going to send in one Juggernaut one after another, in sequence, until all 80 are destroyed. No. That's not what they'd do.
Even if you do hold down the blockade and destroy a few Sathanes (which, frankly, even with 10 Hatshepsuts is a pretty tall order), eventually the Shivans will get the point and do something. Be that send in bombers, make a diversion, or, I dunno, find a way around, they'll still get you.
Point is, there's no simple solution to defeating the Shivans or
any intelligent force. Don't come out and say "If you place a Mjolnir behind the node the Shivans are doomed, that's the way the GTVA win the war", because that's daft. It's not that simple.