Removing SuperGlue in-place
The only times I've ever pulled off superglue were when it was used on the surface, not blind like in your situation. For that purpose, we would add a little acetone and scrape it off with a dental pick. The problem you have is that you've got a bunch of superglue that the acetone can't get to (because it's under the edge of the crystal). 

Unfortunately, for this situation, unless you can get the acetone to wick under and attack the superglue under the edge, I think you're probably done. The best you can try is to put some acetone at the superglued points on the crystal and then pry at it with a dental pick. Other than that, I think you don't have any options.

In this instance, I think domestic harmony can probably be preserved by you replacing the watch. And don't forget to apologize for botching the repair. That will help too.