Adding a "Bonus Game" race track inside a level?

Please login to contribute to the conversation.
I had an idea to use these race tracks for one of my optional missions to save ideas for the other levels while also giving people a chance to play on these with some actual challenge included... as well as not as dumb AI racers.

Could adding one of Bonus Game's courses to a regular level be possible? I once tried by adding the entire P3D file of one race track to one of the level's many P3D files, but the game crashes, and I don't know whether if it's because of the size of the P3D file, conflicting files/filenames/locations, etc.
You could replace a level with one of those bonus game levels technically, but you can not load them in at any point.
I see. I guess I could work around that problem.