What would be good strategies for developing frontend with Vue inside a flow?

You could take a look at FlexDash (see FlexDash: towards a new dashboard for Node-Red), which uses vue.js. It uses Vite (not vue-cli) and that is really quite awesome. If you don't use bootstrap-vue or vuetify then you can use vue3, which works even better with Vite. The hot-reload and debugging helps are really awesome.

Just so I can easily export and import to different Node-RED instances on different servers.

Isn't that just a matter of bundling the files with the nodes so they get served up?

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