Shadow of the Demon Lord
I've had an idea for a while of converting some of my much beloved old Ravenloft modules into SotDL (the bleak atmosphere just lends itself to SotDL so brilliantly) and wouldn't mind running something along those lines if that suits?
I would keep the cosmology and setting of the SotDL main rulebook so they would be the modules set in Rul as opposed to Ravenloft using the SotDL system. For the most part keeps things simpler that way.
I've run SotDL in person but not over post so we might need to iron out some kinks as we go but I don't think it should translate too badly.