Hi Liam,
Am I correct in understanding that you wish to change -vth (the default in your setup) to -vts based on the rpict description?
If so, you can run your current simulation setup and manually edit the batch-files in your project folder and execute them outside Grasshopper. However, doing this everytime is bothersome and it does not require much to integrate it as an option for your setup. In the main Honeybee component I included another camera type as seen in the lines 3077-3094 in the image below - the only difference is on line 3089. This is all it takes to create the above image with the view type -vts.
The changes are in the attached file.
LBlegacy_Stereographic_Diagram_vts.gh (541.0 KB)
A second option
I believe it would be possible to move over to HB[+] as well since it allows one to choose -vts, see image below. However, then I don’t think you can get the Rhino view as easily as the first option (just by typing its name) since you first need to extract the view location, direction and up vector.