Another alternative maybe to use the Blog Posts macro. This allows you to show a selection of blogs from a selection of spaces. The macro can display titles, excerpts or the entire blog posts. You can also filter on labels associated to each blog post.
Using the macro with the correct configuration would allow you to have any blog post appear in a separate space automatically.
Since you are in OnDemand adding plugins will not be possible. You may use Bob's Confluence CLI and try to automate this using some scripts.
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