Santiago wrote:
Is this change plausible? Does it exist in other

I don't know of any such sound change in a natural language,
but just using the "sounding it out" method, it seems perfectly
plausible to me.

Using a linguistic method, I still think it's plausible.  For example,
you could have a sound change that changes all stops (or just
voiced stops) to fricatives after vowels, so that /b/ > [v].  At that
point, you can have voicing assimilation occur, so the sequence
/vs/ > [fs], and at that point you can probably safely simplify the
cluster (though you might want to look at other Fric + Fric clusters
to see if they also should simplify).

"A male love inevivi i'ala'i oku i ue pokulu'ume o heki a."
"No eternal reward will forgive us now for wasting the dawn."

-Jim Morrison