just give them permission to the appropriate xdg config dir that has the gtk themed in it
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On GNOME you set the GTK theme using Tweaks or Refine (Tweaks is preinstalled most of the time but Refine is a newer replacement that's a lot nicer to use). Using one of these two will probably work on any other desktop or WM too.
IIRC I had to keep xsettingsd running in the background for my system GTK theme to be applied to Flatpak apps so maybe that's what you need?