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[email protected] It will fully support using other operating systems including users making their own builds of GrapheneOS. It's part of our hardware requirements. We'll likely be able to make hardened builds of firmware and drivers which can be released in an official way for easy builds without needing to extract anything from the GrapheneOS or Motorola OS factory images.
Well, if you’re using bluetooth to hit your stereo you can get a receiver that jacks in and sits next to it to keep the phone dongle-free. There’s real cheap ones and some higher end ones with better DACs in them (if your stereo doesn’t have a DAC). But it’s not much more difficult to set up a DLNA Media Server or get a chromecast receiver to stream to your stereo over wifi without needing to compress the audio the way bluetooth does.
I’ve also got a bluetooth DAC/Amp with a 3.5mm and 4.4mm jack that you can clip onto your clothes. Basically putting the dongle on the end of the headphone cord instead of the phone. But it runs on a charge. You can use any sort of wired headphones that you want (or connect to a stereo) and not have to be physically connected to your phone though.