If you ever find yourself combining audio and video again, check out mkvtoolnix. In this situation, a video editor is overkill and potentially transcodes the audio or video, taking an hour. This tool is basically winzip for video files, it lets you swap audio and video tracks around in a few seconds.
Please, please just tell me you’re 10 years old. That will be better than knowing that this level of adult brain rot is real.