This would not be the first time I've seen a "Can't get there from here" issue in Apple's API design (once upon a time, we tried to render from one process's pi

This would not be the first time I've seen a "Can't get there from here" issue in Apple's API design (once upon a time, we tried to render from one process's pixel buffer directly into another process's window prior to 10.6, only to discover that was basically not supported; we got around it by flushing the pixels to a memory-mapped file and then flushing them to the window on the receiving side). Unfortunately, that's part of the nature of working within Apple's ecosystem---you want store support, you play by their rules. Their rules don't allow your app to exist, you sit on your hands and wait 'til they do. The benefit gained is a bit of consistency of experience on the user's side.