This only works if Giannis asks to be with GSW specifically and Bucks sees value with the defense that Draymond Provides.
Draymond should be able to do what he does with Steph and change it a bit in order to fit with Dame if they do not trade the both of them for more assets.
Note: The pick traded by the Bucks to Warriors (to avoid the Stepien rule: Portland have the main rights) can be lottery protected in which when triggered can convert to multiple 2nds instead of a further 1st.