I'm trying to think how you even would try to train it, and the best I can come up with is to do it as a completely artificial trick: (1) capture the point position; (2) put it on cue; (3) add the presence of a bird as a secondary cue (this would require having some sort of caged game bird as a practice prop, which seems difficult to obtain and quite probably inhumane to use); (4) fade the original cue and use the bird's presence as the exclusive final cue.Pointer dogs? Well you don't train "pointing" - it is an instinctive part of the hunt sequence and hard wired into pointers to stop there and not complete the rest of the sequence. Not a GSD "thing" though you may see it momentarily.
I've read "The Other End of the Leash" by Patricia McConnell couple months ago, it's quite good and isn't expensive. Definitely a good recommendation.(1) The Other End of the Leash, Patricia McConnell -- as good as you'll get by way of "canine psychology" introductions.