Sorry for your frustration here. I completely understand this when there are issues you cant get resolved on yoru site and need to move forward with those.
Please allow me to explain a little further on the issue of patching individual sites. It's not always possible to resolve an issue with a fix which is created for a newer version of the software. Those fixes have not been tested on the version you are currently using (may actually cause you more harm than good), and may well require the upgrader to do things (for example, changing tables, updating templates, changing javascript) that can't be done by the simple updating of a file.
Let me get this into a ticket for you, and we can see if this is something that can indeed be applied to your site directly. Someone will be in contact as soon as they can