Is there anyway to route what alexa’s microphones pick up to another system (say a raspi) so I am certain it is not listening in when I don’t say the word Alexa

Is there anyway to route what alexa’s microphones pick up to another system (say a raspi) so I am certain it is not listening in when I don’t say the word Alexa. There could be primitive voice recognition on the raspi that would then pass on the full command to Alexa and then on to Amazon for normal processing if it recognizes the command starts with “Alexa”. Is this in the realm of possibility?