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Hello,
I have plenty of experience in this domain (browser data spoofing) and already built an application that does what you need: spoofs Javascript information and also spoofs Adobe Flash data as well (Flash sends operating system, resolution and fonts). The application uses Firefox and is built using a combination of C#(for GUI and control), C++ (Flash data modification) and Javascript (custom extension). The modifications are completely undetectable by the visited websites.
Here is a screenshot of it: [login to view URL]
I am able to modify it so it can be more easily customizable by you (so you can fill in every variable sent by the browser since there are a lot of hidden ones).
I can also build you just the chrome extension(for a smaller fee), however it will be incomplete since Flash will still leak information. You can check [login to view URL] for information leaked by Flash and also [login to view URL] for some info about fingerprinting.
I hope to hear from you soon.