Oh yea, the pay for heavies will never be less than, or even close to less than US RJ pay for expats. Even Shanghai Air pays pretty well on the 757; and, it's a 757. If you are getting a job on a 787, even if the starting pay is realatively low compared to FedEx, you won't be on it for long and you will be set up for life. If you are new to the industry all the better; you'll be getting a type rating and job on the most popular airplane out there. You'll have a long term advantage with job security, longevity and choice.
It sounds like a pretty good deal mate.