Proxies like you're talking about are prone to lots of edge-cases that make them less fun to build than you might imagine. Plus, they'd be looking at getting a

Proxies like you're talking about are prone to lots of edge-cases that make them less fun to build than you might imagine. Plus, they'd be looking at getting a developer to do it, and any developer that would be qualified to do the job is probably going to charge $100/hour or more. And, the proxy will need a server of some kind to live on. At that rate, they might as well get a second system.