Samplitude can import midi and wav files and also analyze the tempo of such a track. The result can be interpreted as virtual timing grid markers or as tempo change. Even linear tempo changes between previous and following bars are possible.
This C7 copy method might work if BB was the initial DAW track.
However when applying such changes to already existing tracks the problems start, in particular with tools like Melodyne which looses all the editing done so far, but also with previously existing markers and areas in the DAW.
I would have to bounce all audio tracks beforehand, apply the tempo change, bounce again after the stretching and then save the DAW project.
Maybe I am just too stupid to do it right, but that's the experience I have made so far. That's why I rarely change the DAW tempo anymore after once having set the desired tempo map in the DAW.

[size:8pt]BiaB2023 Plus, Win11, AMD 8-core, 32GByte RAM, RME Fireface UFX, Samplitude ProX8, REAPER 7, Melodyne 5 Studio, Toontrack SD3, iZotope MP4, NI Komplete 12, Korg Collection, etc.