Hello @calbaker,
I actually heard from it the first time yesterday in the conference “Jahrestreffen 2021 des Forschungsnetzwerks Energiesystemanalyse” from the company Modelon. The developed a python library https://github.com/modelon-community/PyFMI
Maybe it helps?
PS Your post was suggested to me as I was creating this new post about GUIs: GUI/Graphical User Interfaces for people to input data in models