It’s a nice story. But it won’t work.
Harry wants folks to think LV killed the death eaters and not him. But he has trained Draco too well. Given priors on someone defeating Voldemort you would assume it’s Harry, DD, or QQ in that order. Draco knows Harry and QQ were up to something because he and several other kids bumped into them and had a scuffle at the third floor corridor. If that wasn’t entirly obliviated away, Draco will figure out that Harry was involved.
Yeah. I meant Albus Dumbledore. For some reason my brain saw DumbleDore and abbreviated that as DD. Probably symmetry with QQ.