I'm not a doctor, but I think thats completely inaccurate. Wellbutrin is a dopamine/norepinephrin agonist. Clonazepam is a benzo which works on GABA. They are not comparable.

A much safer taper would be something like: alternate 300mg and 150mg every day for 2 weeks, then 150mg every day for 2 weeks, then 150mg / 0 mg alternating.