Editing / Modifying existing Custom Rom Utility?

Hi All,

I was wondering if you could point me in the direction of (IF SUCH A UTILITY EXISTS) a webpage / App / Windows Utility, that can open a pre-made existing custom rom. And say for example it can.....

1) Change the Build.Prop file, from Chinese to English and strip out any other unneeded settings.

2) Remove Chinese Apps, or any other unneeded Apps

3) Replace key Chinese Apps, with English Apps... (ie: swap pre-configured MS Bing Voice keyboard to Google Keyboard)

Basically, just tidy up a pre-released Chinese rom, into English....

Does such an App, or service exist....??? If so, can anyone point me in the right direction please...

Thanks, Lister