A brilliant concept - sort of.
I did a little experiment. I took someone else's WW mystery story that sold (it was well over a year old) and I copied it. Not word for word, but I copied the style, the pacing, the number of characters, how the detective thought. Everything. But I changed everything. If the deceased was a male, mine was a female. If the story took place in the country, mine was smack in the middle of the city. If the plot included a greedy developer who wanted to build a housing project, mine wanted to build a casino. If the killer used poison, my killer smothered the victim. The only thing I kept the same was the type of clue; that only the real killer could know some detail. I kept it because WW uses it so often, I figured they were comfortable with it. So ... same story but a different story.
It made it past the first readers. But it got rejected by Johnene.
So much for that bright idea. But it was worth a try.