The best way for me is very slow methadone taper with occasional benzo use, but at the end of the day there are a few things that genuinely make withdrawal almost painless. In the right combination and from my own experience these are Pregabalin, Temazepam, Tramadol (uplifting/SSRI), Zopiclone (night time). Valium, Beta Blockers also add some relief from the smelly copper tasting kicking, shitting yawning, crying agony that is opiate withdrawal.