I’m surprised I haven’t heard more of this (makes me think its impossible), but I feel like the ideal world is buying big tech’s hardware and overriding its firmware/software to talk to home assistance locally. I saw a post recently about someone making an google nest speaker work with home assistance and they really just made their own speaker and shoved it in a nest mini body. I like the hardware I have, I just wish I had more control over it, and sadly I don’t know nearly enough to mess with firmware myself.