Linearized tilde?

[David Starner via Unicode]

https://en.wikipedia.org/wiki/African_reference_alphabet says "The 1982
revision of the alphabet was made by Michael Mann and David Dalby, who had
attended the Niamey conference. It has 60 letters; some are quite different
from the 1978 version." and offers the linearized tilde, a tilde squeezed
into the space and location of the normal lowercase 'x' or 'o'. (See
https://commons.wikimedia.org/wiki/File:Latin_letter_Linearized_tilde_(Mann-Dalby_form).svg
)The
German WP article specifically says "Der Buchstabe ist in keine aktuelle
Orthografie <https://de.wikipedia.org/wiki/Orthografie> übernommen und ist
auch nicht in Unicode <https://de.wikipedia.org/wiki/Unicode> enthalten
(Stand 2013, Unicode Version 6.3)." "The letter is not included in any
current spelling and is not included in Unicode." Should it be?
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