Yes.

<< Andrew's explanation makes sense and he has agreed a fix is needed so no one will get the key change to work using RealTracks as Andrew described.>>

However, using the Medley Maker tool will play the B chord without the 7th because it follows Andrew's explanation the SGU file follows the key signature thus the Medley Maker will give you the modulation you desire due to it interprets the modulated section of the current song as another song, not as a section of the current SGU in A.

So, your statement:
<<At this point it seems the easiest course of action is to just do it twice in different keys and export the tracks in to my DAW and cut/paste/splice the song together.>> is correct except there's no need for a DAW. BIAB is designed to easily and efficiently do this very task with the Medley Maker. Medley Maker creates a unique and separate MGU stitching the two songs together, creating a transition you can edit to be the F#... chord you want and this MGU file will play the modulated section in B without the 7th's.

Medley Maker allows the user to select what bars to play from each song. Since you are playing a Medley of the same song but in two different keys, you select the appropriate bars of each song to begin and end so they only play the bars in the specific key of that section.

Medley Maker does require that a medley must start in 4/4 time but here again, select any 4/4 Style at the correct tempo, save it as a song and start your medley with a few bars of this song and edit it out after you render the Medley Maker MGU file to audio.

1.) 4/4 song - 2 bars Transition 0
2.) 3/4 song in A - bars 1-51 Transition 1
3.) 3/4 song in B - bars 53-88 Transition 0

The Medley Maker will insert the bar 52 transition and input two chords. Edit the transition bar to F#...

BIAB 2025:RB 2025, Latest builds: Dell Optiplex 7040 Desktop; Windows-10-64 bit, Intel Core i7-6700 3.4GHz CPU and 16 GB Ram Memory.