The Drs these days do use
Methadone and Subs for Pain or Addiction
maintenance. The Subs do not block those receptors (partial agonist) as the Methadone does..(full agonist).
If you are trying to come clean, and I am speaking from experience, I would just taper the dones and do not go on another drug. Just my 2 cents here, as I have experienced both, but the Subs were only short time compared to the dones. I do wish you the best on whatever is it is you are doing this for. We are here to help.