I'll say this once, and probably say this a hundred other times: NSMB2 seems unlikely to crash, much less allow booting of the HBL. Coin Rush Miis and all potential exploitable variables(be it numerical or text-based) both have failsafes, and if there was a thing with local connection it'd probably be the same story as Smashhax (Unix-only and extremely inefficient).
Consider NSMB2hax / Noose / Mariohax impossible at this point.