Linearized tilde?

[Michael Everson via Unicode]

On 30 Dec 2017, at 18:59, Doug Ewell via Unicode <unicode at unicode.org> wrote:
> A defining characteristic of the 1982 African Reference Alphabet was that it was lowercase-only. An uppercase form would be an invention with no basis in history or usage.

Which is why it failed. Everybody who used anything like it or derived from it ended up devising capital letters. 

Doke’s click letters are better candidates for encoding.

Michael Everson