Since nobody else was willing to make such an engine, I have taken up the work of making a simple, easy-to-use OpenGL engine in MMF2. Currently, it can render 1 cube at any specified coordinates. I'm working on making it able to render as many cubes as you want (before the game crashes, that is) right now, but I want to show everyone how much progress I have right now. I managed to make this in only a few hours. The code is heavily based off of the code from the OpenGL collection example "XLua Simple triangle", though it also uses some code I found on an OpenGL wiki for the culling code (however, let's just say that it wasn't easy to transition to culling because of the exact way I did my cube (and it wasn't a problem with the way I did it so much as the exact positioning of the triangles' individual points)).
Controls: Arrow keys move the cube, A and Z keys move the cube towards and away from the screen.