US Citizen Needed as Principal Signer for foreign owned LLC (Payment Gateway Contract) - (I will not promote)

Hi all, I have recently set up a US LLC as a foreign owner. I've been having trouble setting up an account with a foreign EIN or even ITIN alone. Most payment gateways I've spoken to (30+) require a US signer on the merchant account contract (requirement from the underlying merchant bank). This person does not need to have an ownership or even operational role in the day-to-day responsibilities of the company/LLC. Has anyone ever faced the same situation? If so, how did you go about it? Otherwise, does anyone know how I would be able to find a reliable person to fulfil this responsibility? (I will not promote)