Cura used to have a standalone thing that you could use the slice models on the command line, it was used as part of octoprint.
Edit: It was this: https://github.com/Ultimaker/CuraEngine
You may want to investigate using that?
I haven't used a lot of slicers, but I'm not aware of any that would do this automatically. In theory it shouldn't be terribly difficult to do, but it would be difficult to do it well (that is, optimize for fewer supports, etc).
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