You might try doing a google search on urethane headlight restoration. I've seen some decent results that come from clear coating lenses that have deeper scratches. A good sprayer should be able to get them like glass with 3-5 coats, and it probably wouldn't cost more than ~$100.
If you're removal/replacement goes ok, I might be interested in buying the bad lenses to see if I can restore them. I've already got an HVLP sprayer (that's been in storage for 5 years now), and a can of clear coat isn't that expensive.
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