sorry if this question takes away from the great strives the team went through but wouldn't it be much easier (hardware wise) to jailbreak one of the existing great hardware thingies like Apple HomePod or the Google one or Alexa?
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It was only after researching later that I discovered that this wasn't currently possible and recommended approach was to buy some replacement internals that cost more than the device itself (and if I recall correctly, more than the new Home Assistant Voice Preview Edition).