But would that comply with "DNW even a trace of Batman"? Surely implying that there is someone giving him drills in the Batcave or grounding him or setting limits on what he can take on is more than a trace of Batman.

I could even write an entire fic solely about Robin's relationship with Batman without ever mentioning him by name or epithet or having him appear onscreen! But a DNW isn't about avoiding saying certain words.