I got this done by JuanDip Hydroprints, probably one of the best (and only) hydrodipping services here in the Philippines. It cost me PHP 1,000 and took just a little under 1 week to process (there’s multiple steps of painting including primer, dip, and clear coat, and I had to line up in their job queue).
So for anyone looking to customize the look of their keyboard case on the cheap in the Philippines, I highly recommend this vendor.