boonier: I now around-worked most of my projects. Only works if you still have 10.12 installation, too:
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Boot up 10.12, load the song, save all audiounit’s presets in .aupreset format within Renoise, save it to the song dir (don’t forget AU instruments, too, and look into renoise instrument fx sections)
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Boot up 10.13, open the preset files in a text editor, set manufacturer, type and subtype to 0, save the preset to a new file, like “xx1013.preset”
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Load Renoise, load the faulty song. Now load all fixed preset files into the respective plugins.
Bonus ideas:
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Keep the original presets (saved in 10.12), in case Renoise will be fixed and then the modified presets won’t work anymore :3
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Replace as many AUs with their VST versions, using the plugin’s preset mechanism, in case, there is any
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Some plugins won’t evenwork with this workaround. This will be the case then after reloading your fixed project once. e.g. Zebra2 au doesn’t work here