The issue is the Secure Flight protocols. The airline won't like it and that might violate civil law but, with the exception of a potential fraud claim, it isn't a criminal violation.

But what is a criminal violation are the anti-terrorism rules. Secure Flight exists to ensure that those on the Do Not Fly list do in fact not fly. Your situation is not intended to circumvent the purpose of Secure Flight but, in order to prosecute those would would attempt to circumvent the purpose for secure flight, the behavior is criminalized.

That's not to say that it doesn't happen - it does and people get away with it. But that's the same argument for being a drug mule. You should think carefully about what is at stake and the potential repercussions if you get caught before you decide to take your chances. I once heard a (successful) career criminal say that he never stole anything that wasn't worth the risk to steal.