I don't know...
However, an idea I had when the facility was first introduced to the game (incidentally, I was opposed to its being included in the first place, precisely due to the possibility of "turtling") is to put the warp-blocking ability on a component instead of a facility, assuming that works - I never tried it!
(Now that I think of it, it might work on a hull, too... remember the Interdictor Cruiser from Star Wars and Tradewars 2002?
)