2 ways to go about this:

1) Would be to hire a local programmer. If you give us your location, someone here might know someone close to you that's good.

2) Would be to use an off-site programmer. This is sometimes tricky and it really depends on 'what' you are replacing. If you are just replacing some source components with similar popular brands, then it should be easy. If you replacing several components, including the AVR and/or display, then it could be a lot of back & forth.