Now I will not get any sleep until I know it. I was just searching and have seen that there was one project in 1965 which was released with this name. But within shortest time Eastwood took legal actions against it and it was taken down. The studio had bought some copies of Rawhide and made a movie out of it somehow.
I have heard the first time of it, but there are some places in the internet where it is mentioned.
Of course you´re right, it is not an official movie, but it is definitely interesting IMO.
Otherwise there is no movie I can imagine with that soundtrack.