It is by no means salvageable because even a key player in the Council (Ratzinger), with academic degrees, has not been able to salvage it to the satisfaction of the clerical world, not to mention the lay world, and probably not even to himself. There is far too much heterodoxy, ambiguity, and contradiction within it to consider "salvaging" the fraction of a percent that is consistent with permanent Catholic doctrine. That's why it should be scrapped, not scrubbed.
Ironically, however, despite so much abstract vagueness of language in the docuмents, today it is largely relied on by priests as a "teaching docuмent" (also something it was never intended to be), and especially a docuмent for those assumed to be less educated.
A docuмent from which you have to infer everything and contort meaning out of it is of no use to the general Catholic public, most especially those not practiced in intellectual contortions.
It's good for nothing, to be thrown into the rubbish as a dangerous academic exercise with enough spiritual ambiguity to drive a mack truck through it. It cannot be fixed or "saved," but souls who stay away from it can still be saved.