But it would only be applicable to that camera at that ISO for those versions of LR and C1.
Repeating the experiment for 40-100 cameras at every ISO every time either LR or C1 made a major revision...
You can see why there is no such utility and likely never will be.
As long as the training consume no manual steps, only computer time, I am not so sure about the practicality.
In practice, you can probably assume that the "brightness" slider in Lightroom works the same for Canon and Nikon cameras, and that it did the same in Lightroom 2.0 as in 3.0. This assumption might be wrong, but if you do a few samples (LR 2.0 vs LR 3.0, Canon 400D, brightness) you can be reasonably assured that it holds. And then you have reduced the space consisting of "every Lightroom revision" x "every supported camera" x ... to only a few random picked samples.
Ah well. I am not up to writing that utility and I see little commercial potential. I would wish that the major raw developers felt like doing something similar (e.g. make a agreed upon subset of standardized parameters, and each manufacturers make their own import/export into that format). Then user mobility would be larger, competition would be a little harder, and customers could switch raw developer with a little less effort (import image as a "pair" consisting of raw-file with simplified edits + fully developed tiff file)