This is a total disaster for me. I have no spare electric points where my hub is because I have tech 8 items that are in constant use!
Wow this a big problem for me!!!!! 😡😵😤...
Not sure from your description of your concerns if you have understood how the VM 21CV phone arrangement works. It does not require any network connections. Just connecting an ordinary phone to the back of the VM hub as per image at #10 above).
Have you got any spare ethernet structured cable runs from your hub location to a different part of your home? If so, use a patch lead kit like this
to patch the phone signal via one of your structured wiring cables to a different location of the home. This is simply using the ethernet piece of cable to carry the phone signal (not a network connection).
Your description sounds as if your phone gets minimal use. If so just buy a super-simple corded phone and leave it plugged into the VM hub (no power socket required).
Or just update any contacts who may still have your landline number and ask them to remove it from use and go mobile-only.
Or buy a cordless phone system and plug the base station into the VM hub and use cordless phones around the home as required.
The phone change is coming to all telecoms providers, like it or not, so it's a case of finding the least-worst change that you can accommodate.