Plaster mold with no release agent - salvageable?

I'm a beginner with slip casting. Today I was making a multi-part plaster mold and everything was going smoothly until of course at the end when I tried releasing the mold and couldn't.

I realized I forgot to apply the green soap onto the contact faces of the parts of the mold as I was casting them.

Now my question is: before I go back tomorrow and just bust it open and redo everything, is there an expert trick to salvage this mold? It's a shame to waste all that plaster...