Good point to start something. But you have to inspect the code carefully to understand what it does. For example, why is getFormatted() in EuroField overriden? Code should be updated not to use deprecated methods and warnings removed.
Too bad I have no time to work on with this currently. Too busy with other projects. If you got inspired, feel free to check out to source code and improve it. If you send me patches, I’ll publish new versions.