The ONLY way to stop rhino poaching is to A) legalize the trade so that demand can be met legally (there are enough rhinos reproducing to sustainably meet a part of the demand), and B) to get the Chinese Government involved in the rhino conservation, by pushing for rhino farming both in Africa and China, and controlling the buyers at their end.
There IS a demand for rhino horns, no matter the motives, and if that demand is not met prices skyrocket and, guess what... the higher the prices, the higher the crimes will go to meet the demand.
Unfortunately, global conservation is mostly run by feely-touchy people with a Mission, and very little understanding of the reality on ground.
The Chinese are very pragmatic, and only care about bottom line things, like: what do I have to gain or to lose?
So, make it a sustainable business in which they gain. Find the way to get them involved. Anything else is wishful thinking.