1. duplicate the video track to get two of them aligned in time 2. select the item of the first track , go to item source properties (Ctrl F2) and set the flag at 'ignore audio' 3. select the item of the second track and glue it. (right klick and select glue) there you are
You could make a custom action and attach that to a mouse modifier. Like that all you'd have to do is click on the item (with kb modifiers) to replicate all those steps. Personally I think that demuxing the audio from the video, and possibly convert the video to a format suitable for editing might be good ideas, you can do that using ffmpeg for instance. Part of preparing the tracks for working with them, but then again I'm old school :)