I often do this (I think) with my music
Firstly, I build my song in linear form, that is 'without any repeats'. Then I edit the specific bar that needs to be changed.

I then use repeats / 1st 2nd endings to give me the fake sheet printout that I need.
Now the song will play accurately, but the printout will likely be incorrect. This doesn't worry me, but it may be a show stopper for you


BIAB for Windows Version 2019 (643)
Windows 10 (1909)