I work in Landscape architecture and we commonly have to deal with TINs which are highly accurate and need them simplified and linked to revit.
Fun fact @benWILD we have seen in our logs that 12d data is already making it into Speckle.
So someone in the community has built something already!
Care to share anonymous 12d users?
There are several softwares with scripting environments which can allow use of Speckle open SDKs to egress data with some knowledge of a host application‘s object model.