To get a FAA private certificate you can do a paperwork exercise and get the FAA private based on a foreign license. To get the FAA ATP you can use a foreign commercial license to meet the requirement to hold a commercial certificate/license. However to get a FAA commercial you must hold a FAA private certificate. You could do the part 61.75 paper shuffle to get the private, then pass the written test, get a medical and pass the checkride. Your current hours could be used to meet the requirements where ever they overlap. There is a requirement to have 3 hours instruction by a FAA CFI within 2 months of the checkride. The FAA commercial is a little odd with VFR maneuvers that may take a few hours to get to checkride standards.