There is no 12 month proficiency check for the FAA--unless you are talking the Robinson helicopter. Regardless of ANY other rules....in order to fly an N registered aircraft on an FAA license, you ARE REQUIRED to meet the requirements of 14 CFR 61.56 which is the flight review.
If you want to be legal, unless you meet one of the exceptions listed in the FAR, you had better have an endorsement that reads at the very least something like this, regardless of which country you are operating the aircraft in:
“I certify that_____________________holder of pilot certificate number__________________, has satisfactorily completed a flight review in accordance with FAR 61.56.”
Signed and dated by a current FAA CFI.