You can't lower the withholding tax rate that way, that would be illegal due to LoB clauses in the tax treaties. The US government isn't that stupid.
Sure you can do it and lie to them, then you've committed tax fraud in the US. Your call if you want to mess with the IRS.
Sure you can do it and lie to them, then you've committed tax fraud in the US. Your call if you want to mess with the IRS.