@Android_808 - While "save as" bugfix is relatively small and should be harmless, the fixed library is good to stand at least for a while in testing. A solution could be to move that library to stable CSSU branch after some quarantine period. I think there should be no problem with what you ask for.

And TBH upcoming CSSU update (testing) seems to be stable enough as a whole to make it to stable, so maybe there is no need (for now) to split it to parts.