I think you already have the best “solutions” mentioned in your initial post.
I think you mean this: Unfortunately when you right click “add track” in your project… even when right clicking inside the created audio folder, the new audio channel is going to show up on the left side of the mixer console by default. (this is assuming you have previously assigned certain channels to be on the right side in the zones.)
Which is from an old post shortly after Cubase7 was released.
IMO it’s just not very thought out logic. They rushed out the mix console, and after 14 months there are very few improvements.
It’s a workflow issue. Good luck seeing them address it.