Try AnyTun. http://www.anytun.org/
It looks like a reliable tunnel driver, available on both Linux and Windows, and claims to be freeware.
If you do not find it to work or something like that, I would agree with your first commentator - to quickly conduct a session with a lawyer to view the legal contract for the one you found ... or even better, just call the sales department - they can say yes without legal worries.
Building a beast, as you say, is likely to be a pain. I did not do this, so I canβt give a solid assessment, but it seems reasonable to avoid it.
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