I was thinking more on the mentality that Kamen Rider has been more like Metal Heroes since Agito/Ryuki (hence why I said it's been around for over a decade, heck there's some that think BLACK RX was too much of a metal hero). So, if anything, I was suggesting they go back to that brand name rather than introducing a new one.
I should clarify I don't think any of the Riders who have been called Metal Heroes are not deserving of the Kamen Rider name, but I do think the people that say this have a very valid point.
Call what I'll say a stretch if you must, and forgive me if I make any mistakes since I don't know as much about the properties you mentioned:
-The Avengers (and I'm basing this on the movies only since I haven't seen much of comics/cartoons/etc.) have lost people in their lives and one could say that their heroic actions could have been avenging them in a way.
And if that is not enough, there's also what Stark said to Loki: ''If we can't save the earth, you can be damn well sure we'll avenge it.''
-What is a ''Trek'' anyway? I went to look the definition of this too and it says it's a journey, mostly done on foot. A ship flying to reach a destination or discover something new is taking a journey, is it not? So they are indeed taking a Trek through the Stars; and they still set foot on planets and other stars here and there. Do correct me if I'm wrong.
-AFAIK all Looney Tunes cartoons have background music, so they are still showcasing the catalogue, aren't they?
I'll definitely look into that.