Cranial there is nothing to prevent LE being a WireGuard server, but there is no packaging/scripts/etc. in the distro to support that so you'll need to handle it yourself. NB: Our SSH daemon listens on all interfaces by default so if the elderly user "client" end connects to a WireGuard "server" when support is needed you can always SSH from the server to the private (remote) IP of the WG client in a "reverse tunnel" arrangement.
Thanks chewitt, that might be a better way to handle this. Connecting to a server on my end negates the need for a static ip or ddns on their end. I'll have a think about how to best accomplish this.