One reason to consider the plastic lockrings. I just ruined a DA freehub by paying more attention to the torque wrench than the lockring. Makes me
want to get a 3/8" torque wrench as the 1/2" one has a 13" lever arm. To remove you just need a longer lever arm. Don't depend on loctite to
salvage your threads, the cassette will be loose and may not even clear the hub axle depending on how buggered the threads are, but sounds like
they are pretty toasty if you "can't get the lockring off".