Import default route from other namespace?

I have a community wireless mesh network. Some people use their private DSL, to establish tunnels to our overlay network. We use wireguard in combination with namespaces, to build those tunnels to our gateways and separate the "community mesh" and the private household. However, people want to start sharing also their internet connection without a wireguard tunnel. Is it possible to only import the "private default route" from the wan interface of the "home network"-namespace, into the public community mesh network namespace?

I will try creating two wireguard interfaces in the uplink namespace and put one into the community-mesh namespace.