Hi.
I know this post is 5 years old, but I just encountered the same situation and found this thread really useful.
What I did was import all the tracks in Audacity and trim the tracks as a group. That keeps the timing in sync between the tracks. I then saved them as individual 32 bit Wave files. There is an option for “export multiple”. I then imported those files in Cubase. It seems to work well and I don’t think I lost any fidelity going to from on wave file type to another.
It’s not as clean as doing it in Cubase but it seemed like a simply workaround and doesn’t add too much to my workflow.
Cheers