CLDR doesn't seem to make it super easy to contribute. Given
SugarLabs focus, I work with a lot of smaller language communities and
I've been developing some hacked together POT files (with embedded en-WP
links) to allow for Pootle hosting as an interim step to trying to
develop new CLDR locales. I'm also looking at the corresponding Debian
iso-code project files to make it a "two-fer" L10n effort (not thrilled
with Translation Project tool-chain either).
If
you've got a particular language in mind, I could maybe take a whack
at setting up a hacky POT for the emoji annotation. Landing it in CLDR
is another matter.