Wing-clipped vultures too.
No-one was questioning IF it had been done, and I have seen many examples in the past including major European Zoos, and there will be plenty of pictures out there.
Zebras (or any of the other mammals mentioned) will certainly not differentiate between cranes and Marabous. When Crowned Cranes could be obtained in bulk from the wild (for around £40 each in the UK) it was often done. As described above, the birds were effectively used as 'wallpaper' as the scene they helped set was more important than any of its components.
You could also have posted pictures of chimps tea-parties, elephant rides, or other spectacles done in the past?