Cavorting
Yup, missed the first line. No other Jurisdiction (eg pan European) will accept another's Class 1 medical. So Singapore won't accept HongKong for example, and v v . UK/JAA won't accept HKG. You'll have to jump through the hoops with whatever CAA the aircraft you wish to fly is registered with. That doesn't mean you won't get a Class 1 Medical from someone but it might restrict your area of operation further down the line if it's somehow restricted. Also, unless you can solve the problem (see my earlier post) you're going to have problems moving around on the planet to get a job. Each CAA is going to have a good look at your problem-if not solved-and decide whether to issue a Class 1 or not.
S