JOGL-ES is closer to PSGL than LWJGL. Under the "Graphics/Video" section of "Linux Kernel Overview" I found this:
"PS3 has a powerful graphic processing unit with high speed host connection. The GPU is connected to both HDMI and AV multi interface. Although the GPU is connected directly to CBE, no direct access by guest OSes to the GPU is allowed currently. Video mode/format setting is also the role of AV setting driver. PS3 Linux fb driver calls AV setting driver to setup video modes.
Currently X server uses virtual frame buffer to render its image. No hardware acceleration is supported under Linux. See the description above section."
If it is easy to access to PSGL, why don't you give a try?
Under native PS3 it's probably not at all difficult if there were a good JRE.
But while there is a JRE on Linux, there's probably not even an OpenGL driver available under Linux, so under Linux it's not easy, if even at all possible without Sony's consent.
The main point is that (like you mentioned) it is not even *allowed* under a guest OS such as Linux, so there's no point to even try except for the sake of hobbyism and hackery.
A good official solution supported by Sony would be needed; a Linux solution is not usable as long as Sony (quite understandably) doesn't allow it.