I'm working on this but keep in mind two things:
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Once you publish this "global" topic, you will not be able to edit it with just one click. You will have to individually go to all categories and edit manually... There may even be a workaround for this but it's too complex for me to develop alone and I'm not seeing a way to be able to edit the created topic in all categories at once.
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And I still don't know if I can get the composer to work with the plugin, so I do not promise to get a writing through the NodeBB composer. If I can not, you will have to write the topic body manually (this implies that the user knows Markdown syntax).
Even then, would you still like to see this plugin developed?