Have you tried the Canon controller on your Olympus camera? I mean, it won't do TTL or HSS, but it will probably still trigger it (and manual power control is purely a function of the controller --> flash. The camera is not involved, so this should also work). This all works with Godox controllers/flashes (I just hand out my Nikon x-Pro's at workshops and they work on almost all cameras). I reckon ProFoto's stuff will be much the same.