GPLv2+ vs GPLv2
You started out with GPLv2+CCSP, so you can't go to GPLv2+ without having authorisation of ALL authors. This as GPLv2 is not compatible with GPLv3, whereas GPLv2+ is.
There are furthermore some unclear points in the documentation. Some parts mention only GPLv2, some parts seem to be mixed and there isn't a specific statement saying "GPLv2 or any later version", which makes me think the GPLv2+ is more a typo than a well thought through change.