This seems like something you need a lawyer for. Perhaps a web of lawyers. The hardest part with (L)GPL compliance has a lot to do with the significance of the

This seems like something you need a lawyer for. Perhaps a web of lawyers. The hardest part with (L)GPL compliance has a lot to do with the significance of the linked GPL’d code and how enforceable these licenses are. Not easy questions to answer for nonexpeerts and even experts will disagree.