I have a simple Taize piano piece, and I want to use different layouts to present/print the piece in different keys. Is this possible?
Not exactly. But you could create multiple piano parts, copy-paste the song to each, and transpose them as needed. Then print only the part layouts you want to show.
To avoid automatic numbering (Piano 1, Piano 2), you can place each player in a group (in Setup mode).
Or you use different flows for the different keys you like. You can copy the first flow and then transpose new flow to the desired key.