Cant you like walk into any like Lenscrafters or any place that deals with glasses and just ask them to adjust them for you? It's maybe a small charge, but if youre polite and dont creep on the lady at the counter and she's not doing something, they might just do it to be nice since it takes like 2 minutes.
Beyond even that though he has those early 2000s wireframe glasses that are beyond out of style and considered ugly; I cant imagine any other frame really making him look better, but you could just bend them back yourself.
I know people with glasses, youre so used to focusing out of your glasses that you might not notice if they slowly slide down, or you are maybe tilting your head, but I cant imagine how he doesnt look in the mirror and see that it's not his disability inherently that makes people think he's insane; It's that he comes in looking scruffy like he just woke up under the bridge, tossed on his dad's suit jacket he was given for a job interview, he's wearing crooked ass bent up glasses and he's slurping through a request for a headshot for his portfolio once he rises to fame when his new hit single "I Dont Get You Taylor Swift" drops.