'Cloud CDN + Custom URL's — how to?

I'm wondering what's the best way to architecture a setup where we basically want to rewrite URLs on a domain to another domain, but have it hosted on Cloud CDN (for performance).

So, for example, I want to have example1.com/path/image.png on example2.com/path2.png. Note, I own the domain for example1.com, but not the server for it.

To clarify, I want this to be quick to happen too — the URL rewrite tutorial describes "several minutes to propagate," which is too slow. Any advice is highly appreciated!



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