Try like this:
cp /home/nemo/Apps/unified_diff.patch usr/share/patchmanager/patches/launcher-combined/
or,
mv /home/nemo/Apps/unified_diff.patch usr/share/patchmanager/patches/launcher-combined/unified_diff.patch
But before that I would make backup of original patch. And test it if works. Also made sure that I’m able to ssh into device if something brokes. So I could reinstall lipstick.
edit
Tried it, worked sort of. Folders was missing number of items in.