Toki Pona allows for following allophones:
p [p] or [b]
k [k] or [g]
s [s] or [z]
I'm wondering if we can add in
w [w] or [v]
The word sewi comes from the Georgian word ზევით pronounced /zɛvɪtʰ/ and meaning 'upwards' - https://en.wiktionary.org/wiki/ზევით#Georgian