Using Arthur's PSADT script he posted, with some tweaks for my environment, I'm able to successfully install Java 8, as well as remove all previous versions of Java, in one action, via SCCM 2012R2 CU4. The one major tweak I had to make to the script is in the Pre-Installation phase. I had to write the java.settings.cfg file to C:\ProgramData\Oracle\Java. Without that, it was failing on all three test machines I've been using, with the dreaded Error 1722 seen in the event viewer. I've still got more testing to do, before I declare it a full success, but so far, it's looking pretty good.