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ffmpeg add audio to left chanel , convert to mp4 and change the warper

We have a Quicktime uncompressed file with no audio and 1 channel audio file
at the end i need 2 file
– uncompress.mov with left audio
– Codec: h.264 Wrapper: .mov Audio on the left channel.

1-
I need to add the audio to the left channel
ffmpeg -i video.mov -i audio.mp3 -c:v copy -c:a aac -strict experimental video.mov

map the channel
ffmpeg -i input -map_channel 0.0.0 output

3-
convert to mp4
ffmpeg -i my-video.mov -vcodec h264 -acodec mp2 my-video.mp4

4-
out the mp4 to the wrapper.mov
ffmpeg -i file.mp4 file.mov

Is that making sense or is there a better way
thanks