there s no rendering module for SFML 2 at the moment. The modul for SFML 1.6 is not compatible. Using the OpenGL rendering module seems the best solution.
You dont necessarily need to use the opengl matrix system, you can use the matrix system from spark (see Transformable). However you will need your projection matrix set anyway (or use a shader).
I know 4ian uses the openGL module of SPARK with SFML 2 and it seems to work. What you also need to do is surrounding your SPARK draw calls with GLRenderer::SaveGLStates and GLRenderer::RestoreGLStates.