dconf-editor:
Just change to true.
Not ideal and not a global panacea, but has got the handful of extensions I use running.
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Well, yeah. An extension needs to declare that it is compatible with a certain version of Gnome (the supported Gnome versions are listed in a config file of the extension), and that gets checked by the system. This workaround disables the compatibility validation. Nevertheless, the extension in question still needs to support / work properly on said Gnome version of course 
But most of the time they indeed run just fine on newer versions of Gnome
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Hidetopbar works, but it’s settings do not open, this is the only problem so far 
Wonder how long it will take for the major extensions to support Gnome 40.