Consider the possibility of Hamm and Clov imitating the process of departure ( Hamm dying and Clov leaving) rather than experiencing it in Endgame
My first reaction to your question is that Beckett characters do not “pretend” or “imitate” or even “choose” actions. It is a mistake to treat his characters as psychological creatures–they are actually manifestations of Beckett’s ever-present Angst regarding human finality, the futility of action, and the impossibilities of communication. Endgame is actually a series of imitations of the action of departure (that is, death), against which human action is futile (witness the limps, canes, wheelchairs, etc. in his canon), so to imagine pretense here would be directly contrary to Beckett’s intent. If you are considering staging the play, never deviate from Beckett’s explicit and detailed instructions concerning staging, gestures, etc. Endgame is the perfect name for Beckett’s theme here, taken from chess..