Is there any kind of a preventive measure you can take before choosing the name of your YouTube channel to somehow test it and determine if the chances for the need to change it appearing down the line are high? (apart from trademarking)
I wouldn't worry about it. If you need to change it you need to change it. It's not likely to be a source of viewers anyway. Think about how many big channels there are with odd or random names, nobody was searching for them, but they are now, all because of the good videos.
And, I don't think I have ever discovered a channel by its name. Ever. Even once.
I'm getting eager to see what you come up with, its either going to be mind-blowing after all this research or there is just going to be endless years of research