I did none of that. Instead, what worked for me was to change my lifestyle. Paced walk half an hour and lift for ten minutes everyday. Reduce smoking to rare occasions. Eat less, lose weight, and finally get those teeth done.
For comparison, I used some of those nasal strips before surgery and the post-surgery were very comparable, so that might be an inexpensive option to try? I also recall someone mentioning some sort of nose plug thing from Amazon you could get that does the same thing.
I've read horror stories about that. Apparently a lot of the problems could be solved by teaching kids how to breathe (no mouth breathing), having a proper diet (chewing), &c. of course once you're fucked you're fucked and you have to go to these extremes to get your life back. It's like our lifestyle is slowly evolving us out of this planet