Short Answer: No.
Pectus excavatum is not a muscular deformity, so you cannot expect to fix your pectus with exercise alone. Larger pectoralis muscles, better posture, and stronger abdominal muscles may improve the cosmetic appearance of your pectus, but it cannot fix it. Read more here.
The Vacuum Bell can pull out the chest in the short-term, but the long-term efficacy has not yet been assessed. In the short-term, people that may benefit from this approach are people younger than 12 years old with a minor deformity (source). Longer and more consistent application will lead to better results.