That doesn't seem to work for me. I tried your suggestion using the style "J_MODTRI" with the following progressions:

CMaj7 | Bdim | Cmaj7 | Bdim |

"Jazz it down" results in the chord progression:

C | Bdim | C | Bdim |

and the Bdim still plays the dim7th G# (Abb)

Then I tried:

CMaj7 | Bm7b5 | Cmaj7 | Bm7b5 |

"Jazz it down" results in the chord progression:

C | Bm7b5 | C | Bm7b5 |

and the Bm7b5 still plays the 7th A