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Realization to generate a new word on the same form
So you want to go from Spende to Spende+genitive to Beitrag+genitive to Beitrags. In addition to Spacy etc. you might look at Finite State Transducers, which I believe are bidirectional, i.e. for both analysis and generation. XFST and SFST and OpenFST are a few of the FST toolkits. See https://github.com/hfst/hfst for the Helsinki FST; there's a German transducer for it at https://sourceforge.net/projects/hfst/files/resources/morphological-transducers/hfst-german-installable.tar.gz/download. I don't think there is much of a learning curve, and there should be plenty of documentation.
https://github.com/wrznr/timur looks interesting too.