It's verbose, but that's why I included the description 'just needs same socket and user ID'. That's simple isn't it? Of course it'll always need something.

It could be made less verbose by encapsulating in a compose file, or by removing the env var to point into /tmp and instead using whatever the default is for the chosen image. Also it's not necessary to specify the value for an env var being passed through with the same name (I just copied from SO).