Wulff is a hard counter to this. You get the nav token turn one
... and lose it to a tractor beam turn 3. Thats why tractor beam was mentioned together with slicers.
The only issue I have it that the DemoMSU fleet has Demolisher usually going to end it's turn by moving last and arriving near your ship (and firing). So Tractors don't stop it getting in position. Then it activates first and isn't worried about slicer tools or tractor beams. If you cannot activate after the Demolisher moves on turn 2 or before it moves on turn 3, that combo does nothing.
Against a reasonable number of ships that just have Demolisher with them (3-4), this might work.
You make a good point with Dem going last, but i think here a player needs to have their slicer tools/ tractor beam flotilla hunting Dem from the first turn. This will mean from the get-go Dem is struggling to reach its ideal position, and with its engine techs shenanigans curtailed it'll cop a lot of red dice as it struggles across the board.
Im almost (but not quite) as excited for flotillas as i am the Liberty. Having a ship with not (directly) lethal abilities being a real pain in the arse is gonna be fun.