Polish and recoat is obviously expensive. If you're going to trash it anyway, you have nothing to lose by trying plastic polish. I have used it for removing haze that wasn't touched by any solvent I had. Only Acetone, Alcohol, Ammonia and some common household stuff.
Astronomers will grind their own lenses by hand, Their polishes can go from fine to huh? Don't worry about changing the optic unless you use power tools.
I use two pieces of 1" angle aluminum with rubber bands to hold it in place. It holds the glass in alignment very well.