That is interesting. I never saw Omei crane in connection to Shaolin-do, but I ran into it connected to Green Dragon Studios, under sifu John Allen, I believe they call it "Wu Mei crane". Many many years ago I had one of their instructional videos from one of their "Wu Mei white crane" forms, I believe they called it "little crane fist" or something. Since I began study of Tibetan white crane much later than when I had that video, I can say in hindsight that it is little or nothing like our Tibetan material. Stylistically it is very different, does not have any resemblance to any of our forms that I am familiar with, and the fundamental principles and practices were missing from the video, and in fact were never even mentioned.
The Shaolin-do is something that i also trained for a while, and their crane material done at the under belt levels was also definitely not the Tibetan material. In hindsight it also seemed significantly different from the Green Dragon stuff. I don't know if they do additional material at higher levels, which i never saw...
So if Green Dragon's material is representative of Omei, then in my opinion it is not Tibetan Crane, or it has been altered so significantly as to have become something else. Same goes for the Shaolin-do material, as far as I saw it.