When using the tool on its own, you can pick the height field manually. I want this choice to be an option in a model, however I cannot add any parameter for the options in the box. Is this somehow possible?
The 'Height Field' can't be a standalone option, since it is always related to each of the input feature classes. But you can se the 'Input feature class' as parameter of the model, the Height Field option will be visible:
Set Input Feature Class as parameter:
The this is what you get when running the model: