@dooremont should feel free to correct me, but I'm assuming that they imagine using this for a demo tenant that can be sent around to everyone in the French community. If that's the case, the approach outlined by @mrvisser would have some use, although wouldn't be useful once that moves to real production.

On the other hand, there might be a connection with `Inviting guests` here. If we go down the road of a `Rest of the world tenant` that houses all people that don't have an institutional tenant, the `WAYF/DS` approach could be really useful on that tenant.