What do I need to hook it up to HomeKit?
I have about the same. I’ve built a plugin to connect directly to the network connector on the processor. Based on that you can get everything working 100% in HomeAssistant. This in turn can expose anything to HomeKit.
Additionally, an advantage by connecting the system with e.g., HA, is that you can get a log of what buttons triggers what dimmers and what the LED updates look like. This means that you can move these to HA instead, if you want, or at least have them recorded should your processor fail.
Did you decide what to do with yours? We just bought a house with HWI as well. I walked through with the electrician and Lutron guys today and I don’t think it will be an inexpensive change. We are doing some remodeling/finishing currently unfinished areas though.
The cable management is porn-like
r/cableporn
I forgot about that sub. Will have to peruse it again.