Just plain silly.
Replace all pieces of Black (except the king — you are not Chuck Norris, you must have one) with queens. The starting position is then a Mate in 3 (#3).
Challenge: Replace only a few Black pieces with queens such that Lichess (or your favorite engine) shows a forced mate in n, with n as high as possible. Of course, it is always a forced mate in a higher sense, since already replacing a rook is -7. For the record, I managed a #6.