All depends on why you have a class 2 medical.
Yes if you can obtain a FAA CPL(H)on a class 2 medical you can excersise the priviledges of that licence anywhere in the world,but that will restrict your career somewhat.
Before you part with your hard earned cash think deeply of where you want to go in aviation as you will need a class one for an ATP which is where the industry is now for most jobs.