This has been answered for a few months now, since Jan 2023 with the use of the free-for-personal use of Tailscale mesh VPN service. Unfortunately it is difficult to get home users to spend a few minutes reading and learning a new tool even though that would solve all the security and performance problems of Western Digital servers and software.
The activation of the Tailscale subnet software router is literally one command line where the ip subnet address is where My Cloud Home is residing:
tailscale up --advertise-routes=192.168.1.0/24
copying across subnets with two different ISP services with Tailscale:
