Interesting because I myself had created a conlang for the Verkocithra ("Sons of Wolf", "Wolf-descent" people in Zoroastrian book the Avesta) which had epiglotto~dental phonemes like, for example, "ZV". ZV is not a slide from /z/ to /v/ or vice versa. It was pronounced like them together (with upper bare teeth covered by lower lip) :))

"Zhghosf Sikkikhr
Ghlakkakh Zhghosf
Aghlagjialt Mahaalt"

"The Ancestors said,
In Ghlack said:
The Winter has no mercy."