...In addition to that you can't obtain Minecraft PE legally for N900.
There might be something behind what the MC devs have said about GLES ports after all.

But you also have to consider how MC works. It's based on a constant pointer to be present, that doesn't warp from one spot on the screen to another. We'd have to keep the stylus or our fingers on the screen all the time without letting it go in order to play it correctly.

But an Irrlicht port could be useful, yes. And considering that pretty much none of the games available for Linux use OpenGL 3.0/4.0/4.1 actively or at all, it's possible. (GLES 1.1 == GL 2.0)