Just was issued my temporary certificate with Embraer 145 SIC type rating. Nowhere on the US medical does it say anything about your certificate. Just take your 61.58 card or 8710 from Flight Safety or Simuflite down to your local FSDO, and they'll write you out one on the spot.
Windy, one other consideration when operating internationally. The FAA is about the only entity I'm aware of that allows the calender month exemption. In other words, if your medical is dated 2 Mar 06, and you're landing at Luton on the 4th, good luck with the CAA. As far as they're concerned, your medical is expired. Even though the FAA says it's good till the last day of March.
I wish you success!