Any way to force a specific plugin to use single site tables in multisite installation?

Have a look at https://wordpress.org/plugins/user-upgrade-capability/ its provides a way to link to or more sites together. One site acts at the main user base and the other sites link back allowing users to enter other sub-sites for different functions. Its effectively a way to join another site to an existing one and the users don’t need to know they are on a second site. It may take you towards what you are attempting.

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