Applying these gsettings doesn't work:
org.gnome.desktop.wm.keybindings switch-windows ['<Hyper>Tab']
org.gnome.desktop.wm.keybindings switch-windows-backward ['<Hyper><Shift>Tab']
Same when using Hyper for switch-applications and cycle-windows - that also doesn't work.
When e.g. Super or Alt is used, all combinations work.
What does Hyper not work?
Edit : Posted a bug report here:
https://gitlab.gnome.org/GNOME/gnome-control-center/issues/778