You will only avoid W/D until the SubO wears off, there's no way to avoid W/D it's a fact of life, you can only minimize it by tapering down. It makes no sense to take SubO once, and in your situation it would do absolutely nothing to curb your addiction. That website you got that from is full of nonsense.
You're right about one thing,
Methadone isn't the way to go, and it is the hardest drug in the world to come off of.
Suboxone is the ticket for you, but you need a treatment plan from a doctor, not the way you used it in the past, so don't base that experience in your decision.
After you quit SubO you will still have some W/D's, but you'll be titrated down and they will be minimized and not severe.