I wonder if you use the clear silicone seal, whether or not you'd be able to re-open it again in case you needed to e.g., if condensation re-appeared. Hopefully if the headlights were baked again, they can be re-opened. Any thoughts?

I you just use silicone and not an apoxy or glue they should pull apart no problem...obviously the bead of silicone should be used around the outside seal not the inside, then you cut some of it away if you need to pull them back apart. I had the same thoughts.