Build orthomosaic using model surface in another chunk

[ps10]

Hi,
I would like to use the same 3D model as the orthorectification surface for images from different sensors (processed in different chunks). Is there a way to point 'surface_data' for buildOrthomosaic() to a model in a different chunk? importModel requires a path to the model file as well, so my workaround is to export and then import the model. Is there an efficient way to do this?
Appreciate any suggestions.

Thanks