Just ask them first when checking in and they just might, secondly ask at GYE if no luck at GPS. There's no Copa Club in GYE but you don't have to go through immigration just security, so you can ask them as well given how much time you have to kill, or if there's a connections or flight help desk inside security. Often the counter agents at airports are less dogmatic if they see space available. You already have the worst outcome so if you don't get resigned to the 330 flight in advance, you won't be disappointed.

You can try fees and such with calls (good luck calling Copa) but you might just find a sympathetic agent.