Hi Rob,
sorry for late reply, I thought I already answered.

Depends.
If you are on CSSU you shouldn't have this meta package anymore.
If not I suggest to do a reflash and upgrade to CSSU (depends on what you like/preferences/already installed/...)

Regarding manual salvation (correct wording?):
mainly packages from CSSU requiring to remove mp package. I did not run into such prob when upgrading (all from devel repo). But maybe some package QT? requires any higher lib.
What are your repositories? This should not happen inside standard repos (imho).
I would try to cut down the to-be-installed packages and try to find which one requires deletion.
All of the above is more or less obsolete as there will be no more PR1.4 (PR1.3.2). And this meta package is only needed for that case so it is safe to have it removed (saying so even I still have it on device ).