If anyone is interested: this kinda works with ffmpeg(include it in Windows path). Didnt check for errors and stuff so dont send a hitman to my place if it doesnt work please. I am a human being with feelings.
Just render the audio as usual then select the video item in Reaper and then launch the script. Your new muxed video will appear next to your audio file.
The script uses the last modified file in the render folder as the audio file to mux to the video file, so make sure you dont generate extra files in there between the 2 steps
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