The whole point of my question: you have a _pre-existing_ long-running process that you don't want to restart. I am aware of screen and tmux, in fact, I explic

The whole point of my question: you have a _pre-existing_ long-running process that you don't want to restart. I am aware of screen and tmux, in fact, I explicitly mention that I'd like to move the process into a tmux: > ideally, you'd like to move this process inside a tmux