Adaptator

Yet it was an improvement on the stage plays of the former age, when tragedies and comedies were imported from France with an avidity not to be exceeded by the minor adaptators of the present time.

Source: wiktionary

[Gabriel] Faerno was one of the many translator-imitators, or rather adaptators, of Aesop and Phaedrus, antedating [Jean de] La Fontaine by one hundred years.

Source: wiktionary

This trend in King Lear revisions is representative of a general tendency when it comes to [William] Shakespeare spin-offs: namely, that adaptators of Shakespeare often see it as their particular mission to give voice to the characters in Shakespeare who are mistreated, misunderstood, or just plain missing.

Source: wiktionary