I'd be afraid the melted plastic would cause some damage? I wouldn't use glue. It might get in the cylinder. It's a tough one but maybe you could use a coat hanger and attach some duct tape to it with a sticky side out and fish the straw out? One layer sticky side down and overlap it with the layer sticky side out and roll it under at the end. I think it would not be too thick to fit thru the plug hole and should be safe enough it won't fall off? Can you see the straw with a flash light?