There is a reason why honing stones that the average person can buy come on a "flexible" rod so that they can self-center and follow the angle of the bore. Most levels of precision high than that require specialized tools and measuring equipment that can be not only expensive to buy, but can take years to master. I understand what you are going for but I don't think you will be able to achieve the levels of "precision" that you think you can.
That being said I'm all for innovation, I would love for you to prove me wrong but I won't buy anything unless you can prove with before and after measurements.
FYI running a machine shop is NOT cheap and that's why many shops have to charge so much for seemingly "simple" jobs. This mentality of blue collar workers overcharging is what is forcing so many manufacturing jobs to be sent overseas. Once they're all gone then you will have people blaming politicians for driving jobs away... It all begins with OUR behavior.