Well, firstly, this isn't the "DNW even a trace" DNW, the one referenced in the OP was just "I DNW (insert character(s) here)". Otherwise the OP presumably wouldn't have found the question of whether mentions were okay ambiguous enough to ask about!

And secondly it just seems like you're bending over backwards to find reasons to claim this DNW is impossible when it's extremely straightforward and I don't see how it would be particularly difficult even in 1k of canon-typical casefic. I've read plenty of actual Batman comics where the characters manage to go for whole pages without mentioning or thinking about Batman.