Good news updates -
Not only is my air conditioning ice cold once again after refilling with refrigerant (added a partial can of r134a with UV dye and stop leak, will continue to monitor of course), that godawful grinding noise it's been making for like 3 or 4 years now is almost gone. It's still there a bit, but it gets better with every drive and isn't audible from a block away like it used to be. A couple forum posts I read from forester/XV/etc claimed that these compressors make a similar sound to a failed bearing or other compressor issue when the refrigerant is low.
If it ends up going bad again, if it's the condenser I'm just going to replace that since it's cheap and easy with autozone loaner equipment. If it's leaking at the compressor or the compressor otherwise fails of course I'll replace both.
Mirror has been holding solid and the glass seems higher quality this time than they used for my last safelite replacement. Hopefully both of these things stay this way.