I don't understand the point of all this.
The photographers who took a MF to a safari found out that they could make different images. Images that could use the higher resolution of the MF, but would be taken with a shorter focal length. More atmospheric images, groups of large mammals, etc... By seeking the longest lens available for MF, you seem to be trying to force the MF to do the same job as a 24x36 camera, except that it will not be as good. If you want to take the kind of pictures a 24x36 is best at, use a 24x36. If you want to use a MF, take the pictures for which the MF is the best camera.