I'm not sure how easy or high-priority this task will be, so I'd like to propose some work-arounds.

1. It's currently possible to use the Vue devtools browser extension with Codex inside of MW by running in Debug Mode (append &debug=true, or 1/2 to your URL). I personally find this to be extremely helpful and makes classical debugging unnecessary for most situations; you can see live component data, events and payloads, etc.
2. For deeper debugging of Codex itself, I'd recommend just pulling down the upstream repo and running Vite in development mode. There is a sandbox page at index.html that you can use to play around with the various components – just run npm run dev to see it; you'll get hot-module reloading so that you can see tweaks as soon as you make them. You also get each component delivered as a separate module in this case based on how Vite's dev mode functions.