Kodak trade trialed a 200 and 400 ISO fine grained improved Kodachrome film in about 1990 and the films were rejected by the recipients of the samples. I have said this over and over. They said that E6 is better or it has more potential. So..... What can I say but you cannot sell what no one will buy and what the magazine editors panned in their evaluations. That is who you must discuss this with.
As for hand processing, it can be done. We did the re-exposure by draping the film in a "U" loop with clips at the top and a weight at the bottom. A light was used in the center of the "U" to re-expose the film. The problem came about in calibrating the light. That is the most difficult step of all other than mixing the developers and getting the couplers and CD-6.