Trade only? : yes, you go first! :)
Reno isn't vital for the Highlander deck. There are so many powerful cards that you can slot in, although I fully acknowledge that Reno's a very good card. Chenvaala is actual support for the Cyclone archetype. However, Chenvaala might not prove as powerful as she feels currently. I'd hold off crafting either of the two.
It's a gamble this early in the expansion, but if I were to point out any of the legendaries from the set as "Safe to Dust", this would probably be the best candidate. It's pretty much a Hi'reek, the Bat vol. 2. Even if it does find a home, I'd assume that it's rather easily replaced.