What if we threw Shinichi in there just for shits and giggles, and Brucie Wayne also has to make sure this foreign detective from abroad doesn't find the Batclan out.
okay so most of these paragraphs are a little bit of set up before the scene for which variation of the detective conan fanon is in use.
Lets say its a Pre Cure, post Kaito Kid friending, post Black Org destroyed Shinichi.
So Conan sees this really dumb Brucie Wayne, and is watching 'Shinichi'(Kaito) to make sure he doesn't start Patronizing the Waynes as Kaito visits the Suzuki's.
Kogouro is back in Japan studying, and Ran knows the truth and is fully broken up with Shinichi. Which is part of why Conan and "Shinichi" are abroad while Ai cooks up a cure with her original research.
Conan is not sure if he really wants to grow up/be cured yet, and is no longer 7, you heard it, the boy wonder aged, he is 10! Prime Wayne adoption Bait. "Shinichi" is taking him around the world since his parents are busy(Kaito is rendevous with other theives and networking, he's meeting Catwoman and knows her identity).
Conan isn't quite so lawful anymore. Those years of lying broke his lawful Alignment. He is now chaotic good and trying to reign in Kaito KID.
Kaito has... new enemies. And also new sponsers, he may or may not be legally stealing and recruiting qualified stage hands(catwoman) for future heists(gifts from Suzuki family and other fans, but only allowed to take it if its stolen with a show). But he needed to be "Shinichi" to get in the door of some prestigious places. Kaito is better at networking than Shinichi ever was. This is with the Kudo family blessing/and pranks.
Shinichi glares at Conan, as they explore the buffet. "I thought you said you broke the Shinichigami curse..." Shinichi grabs Conan by the bicep and stalks over to the dead body. "Clear the scene, my apprentice will check for a pulse. Hopefully this is only the promised entertainment, although I can't say you have good taste."
Shinichi sets out, whipping caution tape from who knows where and sectioning away the tables near where the man had fallen. With a ribbon dance, the area around the man was sectioned off and any wayward guests were spun away. If they resisted they landed in food.
Conan has gloves on when he announces there isn't a pulse, then Conan begins bagging the man's food and silverware in individual evidence bags.
'Shinichi' notices several people look quite twitchy at this turn of events, and mentally marks the servers and servants who scurried away or panicked, as well as the hosts glint of sharp eyes and then immediate trip over his own feet and into the arms of ...Selena.
"Does anyone know the victim? While I was serving myself dessert I remember he introduced himself as Fenton. Aren't they stage prop designers for Ghostbusters?" 'Shinichi' sharply turns toward Brucie Wayne, and takes his hand and lifts him out of his false faint, smirking, "Does anyone else have information, such as who invited him?"
Brucie Wayne swoons for real this time, but Selena is no where to be seen so Shinichi princess carried him onto a nearby table.