For anyone stumbling over this question when looking up information on multilingual multisite instances: WPML (WordPress Multilingual Plugin) supports what OP was looking for by “linking” posts and pages in the backend across all languages.
If a post/page is linked to all other language variations, you are able to switch between the different languages of the post/page via a widget or something alike.
I have used this in multilingual multisite instances and found it to be the easiest way, especially if you have non-technical people generating content for your sites.
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