Something along these lines?
1 - an example, here we have this dragon object you can’t distribute. But you’ve made a material for it in Bryce, but the material needs the model to be at a certain scale/position/rotation because it is world space or some such other Bryce specific material mapping mode.
2 - copy the matrix of your model. Create a Bryce primitive cube.
3 - paste the matrix of your model onto the cube. Copy the material over to the cube and delete the original model.
4 - this is what you supply.
5 - then the user brings in the obj they have. And copies the matrix of the cube, pastes it onto the obj and likewise for the material. And so the original setting for the first image are restored, the cube deleted and you have not had to distribute the original model.