Initially I had tried to paint on the superglue using a silicone spatula, but that only worked until the spatula caked up, and was difficult to remove.
And then came the moment of brilliance. Use cheap glass spray bottles from ebay, at around $20 for 10, filled with cheap super thin superglue. This produced a matte finish reminiscent of the original powdercoating. I've had to use really trashy chinese superglue from aliexpress, a vastly inferior formula to American brands; it cures near instantly and leaves behind a very wrinkled finish.
I'm communicating with my regular high quality glue supplier for a liter's worth instead of just 50g bottles. That stuff, even when wiped on, dries basically crystal clear. I've had massive success coating my 3d printing bed with a thick and even layer of it, but it seems to react with the polymers in the superglue so that it sets faster when I wiped it on paint. If I sprayed that though, I suspect it would create the perfect surface.
Pics here

The last one is bad looking because the paint wasn't fully dry
