One thing to consider is that whatever sealant you put on there may oxidize faster when exposed to the sun than the OEM coating. So you can also consider living with the scratch or replacing the full headlight.
If you do polish, you may want to reseal with helmans spar urethane (gloss). Most people have good results, but mine started peeling within less than a year (on my old WRX). So if it were me, I may consider just living with the headlight scratch (or sanding/polishing in just the confined area).
But this is just my experience, which may have been a uniquely bad one with polishing out a headlight.
Sorry to hear about your misfortune. Good luck.
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