I’ve updated my Google doc to use the H. samplerate as the basis for PAR and damned if it isn’t close.
Get your source width as SW
Get your line multiplier (e.g., Passthru = 1, Line2X = 2, etc.) as LM
Get the H. sample rate from FBX’s page for each console as HSR
Divide the source height by 240 for source height multiplier SHM
Target Width = (SW * LM) * (390 * SHM)/HSR
You can check my values here: https://docs.google.com/spreadsheets/d/1WoRFwFejaDGvePbJoHUsy4eZ_MRXm9ETvsPR5xqWsik/edit#gid=1954283489