Did you ever get an answer? I'm trying to do the same thing
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Look into a feature/standard Jive Supports called "Open Search" (Home - OpenSearch)
Once setup on the remote site (the site will need to support open search), you can tell Jive through settings in the Admin console to return returns from the remote system (System->Settings->OpenSearch Settings).
Here's the caveat...it does not work with spotlight search, only the search results screen you encounter when you hit enter when typing into search.
It will appear as a new search results source in the left column once setup properly.