Can I force creation of new workspaces for "move container to workspace next"?

Thanks! That's interesting and a good project to know about -- but I don't think it answers my question (unless I'm missing something). Quote from readme: "-n and -p will only jump to existing workspaces, and if you go beyond the beginning or end of the numbered workspace list, it will wrap".

From the docs.... Those who have configured i3 to display workspaces on specific monitors can use -E/--nextempty to go to the first empty workspace with a number higher than the workspace they are currently on. -- I believe you are looking for something like 'quickswitch -jE'

I appreciate the deep dive (and I'm now happily using quickswitch.py, so thanks again for the pointer). But this still isn't quite what I'm asking about: I want the next workspace, regardless of whether it's empty. That is to say: create it if it doesn't exist, or use it if it does exist.