Hey Slasmir,
Were you able to get your approach working?
I found that what you are trying to do, is primarily used with particle effects so they can control the self shadowing as well as shadows from other objects. There currently is a bug in place with Translucent Self Shadowing which we are investigating.
From what I understand, you will want a ‘Default Lit’ and ‘Translucent’ material for your set up.
Cheers,