We've released v0.11 of vfbLib!
What began as a reverse engineering project in 2022 now has had a kind of official blessing from Yuri Yarmola of FontLab, who generously let me have a look at his original VFB code.
I am very grateful, for this has shed light on some intricacies of the format I would probably never have figured out on my own.
https://pypi.org/project/vfbLib/
https://github.com/LucasFonts/vfbLib/releases/tag/v0.11.0