"I need an FAA PPL to fly in USA."
Actually you don't. What you need is a validation of your ICAO compliant licence. The FAA receive a package from you and your authority and issue a validation of your foreign licence. As a result you are allowed to fly on N reg aircraft as long as the condition of your original licence are met i.e. currency, pc, medical etc.
There is no training required if everything is current. The responsibility is yours...
IH