I'm not sure about adding them to the nadeo campaign, but you can add the bonus tracks as a custom campaign. I added all the bonus tracks in 4 series inside a custom campaign, mirroring how they look in the track folders. You can see what it looks like in this run: https://www.speedrun.com/tmsex/run/yv9qwj8z

When I have some free time, I could check if this custom campaign can be easily shared or downloadable.