Support for English in Switzerland and other countries with high English usage

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A significant number of people resident in Switzerland speak English, either as a primary or additional language.

Source: my own personal experience, but numbers are available from http://www.bfs.admin.ch/bfs/portal/en/index/themen/01/05/blank/key/sprachen.html

With several international financial institutions based in Switzerland, even more people use English at work.

When configuring software, it would be beneficial to be able to select a "en-CH" locale, in order that regional formats for dates, times etc. adopt the Swiss conventions but interfaces are presented in English.

What is the process to adopt "en-CH" as a supported locale in the Unicode CLDR?