VPN redundancy output point

I want to make sure that my wireguard server0 will automatically switch to another output point (server1 or server2) depending on the network availability, hope schema will clarify what I mean:

WG client --->  WG Server0 (Entry point) --->  WG Server1 (output point1) # available 
                                        \--->  WG Server2 (output point2) # unavailable

WG client --->  WG Server0 (Entry point) --->  WG Server1 (output point1) # unavailable
                                        \--->  WG Server2 (output point2) # available 

So, we got two tunnels:

first one between client to server0

second between server0 and server1 or server2 depending on public IP availability.

Final goal is to make sure server0 wireguard configuration has got correct public IP(server1 or server2) for "EndpointIP" directive.

any suggestions?