Thanks for all the replies and sorry if I wasted your time.
After reading all your answers, some mails on debian-devel and other discussions on IRC I should have understood enough.
The transition with package renames and other rebuilds handled triggered as a batch in cooperation with the buildd maintainers seems better that my idea of uploading all cinnamon 6.0 packages without rename (but breaks). I started test of 6.0 package prepared in git but I think not enough if transition will happen shorly (less than one week).
do you still want to migrate also cinnamon-desktop chain despite the trouble I gave you?
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