You have the worst of luck. I guess they don't call it the Rocky Mountain State for nothing.
But seriously, the plastic tweeter panel can be removed very carefully. Its the standard GM plastic fastening clips. If you're going to a salvage yard to get a replacement mirror, get one thats still attached to a wrecked Alero and watch the parts person remove it. Thats what I do when it comes to trim parts and panels, etc. Also those guys are real helpful giving intructions because they want you to buy the part. Good luck!