Of course, it's not safe. If you want some sort of assurances to ease your conscience about editing a major system file, you probably won't find it. Whenever you start tinkering with your system, you run the risk of majorly screwing something up.
That said, I've edited the build.prop file on multiple devices without ever having a problem. I've also borked my machine twice and restored it. Before you give it a shot, though, you might try downloading "Market Enabler" from the Market and see what happens.
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