Lando and APs and and ECMs should be enough to make a MC80 stand up tolerably.
If, as the math indicated, you're looking at an average of 24 damage via the triple, an MC80 may not be durable enough. Its total shields are only 15 (4x3+3 = 15; 15+8 = 23).
The issue with the "Clonisher Test" is that it reduces the game to a dice/numbers game. Can you let the Demo swing hard and survive? Well, maybe you get to contest. Can you not? Well, better pack away those capital ships.
ECMs don't have much value against Demolisher. Odds are the odd red accuracy will be used to Screed a black to a hit+crit.
You'll probably need them against the rest of the lists you face in a tournament, however.