I'm sorry to inform you that it ins't possible to integrate an OnDemand instance with an external SDK or other application, and in this instance an OnDemand instance would be particularly inappropriate because you don't actually have system-administrator privileges and cannot install plugins in an OnDemand instance. Therefore I would recommend that you install a local instance for plugin development, which you can install locally on Mac OS x, (for development purposes), and purchase a license for $10 so a local install would be a much better solution for you.
All the best,
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