Slowing/stretching the audio to four times its original length will likely introduce artifacts. You may want to consider augmenting/replacing some of the audio. Think about it from a sound design point of view.
Here’s a link to a video explaining what Ty has been saying. While your wireless setup doesn’t have all the controls mentioned in the video, it explains gain staging well.
If I know the video is for web use I usually choose 23.98. Doing that ups the encoded quality at a given frame rate as the encoder can apply the data rate to 24 rather than 30 frames every second. If for television, then 30 is the way to go.