We were late to the party on this and just began looking at it in the November-December 2014 timeframe. We applied all the notes available at that time but as the deadline was extended slightly, our users did not look at it until recently. Of course, now we find that a myriad of additional notes were issued and the solution is still not finalized.
We have been trying to follow the saga in the long thread here on SCN regarding all the hard work users like you have done in trying to help SAP along with this process. So I must concur with your assessment and observations about the process here. Quote from my seasoned in-house programmer who had the unfortunate task of deciphering and applying all the notes: "SAP should be ashamed of themselves on this one. I've never seen such sloppy work."
Clearly I understand that SAP cannot be staffed with developers to handle new requirements for everywhere in the world, but there are legions of ABAP programmers around the globe these days who clearly would love to help. Crazy thought, but why not assemble a project team in cases like this, just like those of us in the business do? The team could be made up of inside and outside resources. People who are responsible for digging in and truly understanding the objective and delivering a workable solution. Instead, we are forced to conduct our own research among our peers and piece together a solution which doesn't even run properly without applying a complicated nexus of sister notes. From my following of the other thread, it appears as though the process in this case has been to wait for engaged users like you to raise issues, then they assign someone to fix and issue yet another note. There is the standard disclaimer that it's better to apply notes for these types of things in a support pack rather than individually, but clearly that wouldn't help in this case since there are still notes being issued.
I've been using SAP for more than 17 years now, so I understand how things work. Unglamorous problems like this don't make money for SAP and therefore resources are directed toward other areas. I get that. But we all use the ERP solution for core aspects of our business ... things which we are LEGALLY required to do. It's all part of the solution and needs to be supported in a responsible manner.
Sorry for the rant. Thanks for listening. 
Michele