Welcome to medhelp while I cannot offer advice on the methadone, I can offer you support for wanting to get clear and free of the drug that has taken over your life. Just from reading here and from friends experience subs can be just as addicting, I agree with above that weaning methadone sounds beneficial. Have u checked with another med professional for their opinion?
Just taper off the methadone. I don't see any benefit in transitioning to suboxone. I used suboxone for two years and I've used my share of methadone. The only drug that can give methadone a run for its money regarding withdrawal horror stories is Subutex/Suboxone.