Sorry for the delay. Here are the limitations to Density based topology optimization. I haven't tried it but since the limitations state that imported plies are not supported, I assume you cannot include them in the analysis even if they are not included inside the optimization region. Not sure but you can try suppressing the composite body, add imported displacement at the composite-solid body connection and proceed with optimization.
I am not an expert in optimization algorithms but I know that there are several problems associated with density based optimization of structures with geometric non-linearity, like the tangent stiffness of elements with low density becomes negative during the optimization process. There are several research articles which propose techniques to handle non-linearity in topology optimization. Please have a look if you are interested.
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