In that case, one suggestion would be to fix the audio to fit the length of your final rendered video. But, there is a way you can do that without any trimming. You just have to adjust the duration of the audio to fit your finished video.

A free software download, like eac3to, can do that for you. Use it to demux the audio from the video, giving a .WAV file. Then, just adjust the duration–making it slow or fast.

Finally, mux your adjusted audio to your finished video. Check the beginning of the video and check the end of your video. If both ends are in sync, you’re done. If not, go back to eac3to again and adjust the audio to another duration time. You may have to play with the duration to get the right fit.

I, personally, have not used it, but other members here have.