Approx. 400 or more subscribers of Unicode Public happen not to be subscribed to CLDR-Users. Now there is a thread that might be of some interest also to non-CLDR‑users. Itʼs about some main functionalities of keyboards intended for many locales, not about specific details of a particular locale tailoring.
Please take a look at: http://unicode.org/pipermail/cldr-users/2018-February/000731.html to learn more if interested. Regards, Marcel