I've only snorted the 1mg and 2mg klonopins, so I'm not sure about the mintyness of the .5s lol. The only real benefit to adding powder k-pin to oxycodone or any painkiller powder is to make it more pleasurable inside the nose and the drip lol.
I'd say do not eat food for 12 hours, swallow at least 1mg of klonopin, and rail the roxy about 45 minutes later, or when you begin to feel the effects of the klonopin. Use caution though because benzodiazepines/barbituates and opiates together will lower your heart rate and blood pressure etc. (I had a cousin who died because she had a seizure, went to the ER, where she was given morphine and phenobarbital. They sent her home and she fell asleep and stopped breathing. She was already blue when they found her. I didn't really know her at all cause we always lived so far away, but I just wish they held her for observation)
However, benzos or barbituates together with opioids usually creates quite a lot of euphoria....I used to rail the OC oxycontins before the OP came out, and swallow about 10mg of rohypnol lol. Wow that was some euphoria there haha. Similar to the feeling of E but much cleaner and no cracked out shitty feeling the following day lol