There is not currently a way, but someone had a name for the way it could be done yesterday when I was reading around on this topic. I forget what it was called...I'll have to see if I can find that again. Multiple accounts--beyond a legitimate 3-4 for varying actual business models that INDIVIDUALS may need are necessary-- yes, but not beyond that.
When you say "the rewards would stay the same" I'm not sure what you mean. This whole conversation is about adjusting the rewards system. "Trending" is just the most visible example of the faults with the current system.