Existing locale data in Java should be customizable

The Locale Sensitive Services (LSS) SPI in Java SE 6 provides a means for users to add their own locale data. However, there is currently no way to modify the existing locale data provided in Java -- the data formerly provided in LocaleElements*.java now spread in CalendarData*.java, CollatorData*.java, CurrencyNames*.java, FormatData*.java, LocaleName*.java and TimeZoneNames*.java.

An ideal solution would make available both programmatic and non-programmatic customizations.