I'm very new to straight shaving and honing razors myself. Your invention is good for knives. In fact it looks a lot like the design of the "Wicked Edge" knife sharpener. This system is considered one of the best designs for sharpening systems. Another system is the Edge Pro which I have. I tried the Edge Pro on a razor and while these systems control the angle for you (compared to free hand sharpening) they are completely unnecessary for razors. As someone else mentioned the angle is controlled by using the spine. I used an angle cube (digital level) to check the edge angle on my two razors. One is 16 degrees and the other (newer) is 20 degrees inclusive. These are approx with about +/- .5 degrees. The spine on the newer razor is thicker which will result in a higher edge angle. The one with a 16 degree edge angle is a gift from a friend when I started straight shaving. The edge was pretty damaged and it had no handle. I worked on the edge and made a handle and now it's a pretty nice razor as far as performance goes IMO. The handle isn't the prettiest thing in the world but it works well. It has seen much use and sharpening if the appearance of the spine is any judge. It obviously has been thinned by the stone over many many honings.

Another thing about your system is a razor requires a super light touch due to the edge being so thin and fragile. While this light touch is possible with a system like yours it takes a bit of practice. There are tons of videos on using the Wicked Edge system. Those things sell starting at about $300 or so. The price goes up with additional accessories, stone types or grits, etc.

Jack