Havick, Ralphi.and a couple of others are really trying to help here. Those in denial who turn up in the USA without a CURRENT IPC & CURRENT medical do not understand how the validation of a foreign licence works. The civil aviation authorities in most countries can NOT validate something that is -at the time of the validation - unusable in the country of origin.
Besides, with such an important career move, would you not want to be right up to speed on your instrument skills? To rock up somewhere with expired qualifications is either ignorant or arrogant.
For those bemoaning the cost: a wise bird once said “to make money you have to spend money”