The best way seems to start with low level work and move up the chain.
It'll be interesting to see. Making good chocolate certainly isn't easy. Nor is compliance with food quality standards..
But if they control enough of the chocolate production, I guess foreign manufacturers may choose to setup a processing factory in Ghana.
Of course, it's not without risk. Foreign manufacturers could perhaps invest into farming equipment to make neighboring Ivory Coast more productive at farming cocoa..
But doing this certainly creates uncertainty and instability, which is rarely good.
If you are buying an $9 chocolate bar, in addition to quality, consumers are also looking to support fair business models. So improving the labor conditions, something many European companies seem to show little interest in, is as much a part of finding better partners as increasing quality. And more and more, these issues are just as important as quantity.