Timeline Start later 2

I refer to the following thread, but unfortunately it is closed, so I can’t write anything more in it.

I have the following problem: I started a song. There are many time changes in the song (I constantly change between 3/4 and 3/4, in between there are also 5/4 bars and 2/4 bars - so quite complicated).

Now I noticed that I forgot to insert a BBT marker at the start of the song, as described in the other thread, so that my song start is at bar 32. If I want to add a BBT marker later, it moves the other markers with the tempo and beat changes. Is there any trick on how I can set the song start to bar 1 afterwards without having to adjust all subsequent tempo and beat changes individually by hand.