Short answer: it can't yet be done.
I spent a bunch of time configuring my system to be able to compile a GPU-accelerated (via OpenMM) Gromacs binary. I should have read the latest Gromacs v4.5.3 release notes: "Force fields: Supported FF are Amber, CHARMM."
So despite the fact that many of the other system parameters for which the MARTINI forcefield is designed are not yet supported by OpenMM e.g.
WARNING: OpenMM does not support leap-frog, will use velocity-verlet integrator.
WARNING: OpenMM supports only Andersen thermostat with the md/md-vv/md-vv-avek integrators.