Being an IV drug user definitely disqualifies you. I know because I was going to sell plasma for drug money, haha, but then realized they probably wouldn't be able to hit my jank ass veins anyway, then realized that any risk of exposure to HIV or Hep B/C is a nogo with blood donation, so I'm sure plasma is the same. Even if you only ever use sterile needles.
Maybe bupe is only an issue because they assume it means you're an IV drug user (even though it obviously doesn't, but people are ignorant).