If anyone is interested, I have an alpha version for test a re-written pyisy / Home Assistant integration.
It can be added to Home Assistant using HACS and adding a Custom Repository: https://github.com/shbatm/hacs-isy994
While this includes the features posted about in the other thread, this includes a significant re-write of the underlying project to make it faster and more code conformant.
For the most part, functionality is the same as what will be in Home Assistant 2023.2.0,