After speaking to a friend studying the history of languages, she explained that /k/ is a plosive sound (made using the mouth, lips and/or tongue) and that French language is dominated by fricative sounds (created by air passing through a constricted of partially obstructed vocal tract).
After looking at examples of his glossolalia, one can see that many other plosives are used, such as 'pec te', 'pek ti le' and 'pte' from To have done with the judgement of god. This tendency to harsher sounds is further suggested by Artaud's accent and pronunciation of these sounds as more akin to Italian than French;
where /h/ is never mute; /u/ is pronounced /ou/; /z/ is pronounced /dz/; /g/ is always hard, and slightly general when followed by /h/; the final /ch/ is pronounced somewhat like the German /ch/ - Paule Thévenin in a note to Artaud le Mômo
It's therefore possible that Artaud was reaching for a more plosive language; or a possibly more violent one in terms of expression. I was wondering if people thought it plausible that by the use of violent plosives and the frequent harsh stopping and release of the glottal sphincter caused by the /k/ sound, that Artaud was offering an act of spitting (or excreting, as suggested by 'caca') the inner feelings desired to be released, which along with the allusive screams of expression could violently assert emotion?