At the end of a sentence, I want to insert the following (parentheses included):
(proxy my parents, of course).
I sent my brother to his room (proxy my parents, of course).
But this doesn't sound right. I know that the preposition "via" is used this way quite frequently:
I accessed the internet via my school laptop.
My gut tells me "(with my parents serving as proxy, of course)" is definitely idiomatically/grammatically correct, but it also gives me the feeling that that usage is tacky, and just doesn't sound like good writing.
So what can I do in this situation to both use "proxy" correctly and also form a well-written sentence that's nice on the ears? Can I use "proxy" as a preposition like I originally did?