is it possible to rebase a branch with all it's subbranches in git?

i often use branches as quick/mutable tags to mark certain commits.

* master
*
* featureA-finished
*
* origin/master

now i want to rebase -i master onto origin/master, to change/reword the commit featureA-finished^

after git rebase -i --onto origin/master origin/master master, i basically want the history to be:

* master
*
* featureA-finished
* (changed/reworded)
* origin/master

but what i get is:

* master
*
* (same changeset as featureA-finished)
* (changed/reworded)
| * featureA-finished
|.* (original commit i wanted to edit)
* origin/master

is there a way around it, or am i stuck with recreating the branches on the new rebased commits?