As you indicate, It is a rhetorical device (did you edit your title or am I going slightly mad? ;-)
In rhetoric, a rhetorical device, persuasive device, or stylistic
device is a technique that an author or speaker uses to convey to the
listener or reader a meaning with the goal of persuading them towards
considering a topic from a perspective, using language designed to
encourage or provoke an emotional display of a given perspective or
action. https://en.wikipedia.org/wiki/Rhetorical_device
The ancient Greeks were very fond of these and there is a whole catalog of formally-defined ones.
At a quick glance I couldn't find the one you use but (as the saying goes) "The Greeks had a word for it". I'm sure it's in there somewhere.
P.S. Despite getting an upvote, I think I'll have to delete this answer because it doesn't fully answer the question.