What about taking a razor blade and breaking the seal then it should pull apart
just a thought or your gonna need to spray something on there to dissolve the rtv
Reach across the top of the engine from the left side, and rest a strikable prybar against the clutch release shaft. Then give it a couple sharp rapps. Don't go crazy on it. With it leveraging from that high a location, it can break the seal around the top, and the rest of the over should be easy. You can also try a fitting a paint scrapper inbetween the cover and case, and "ripping" the rtv out of it.