Turns out it was another one of those "we're going to have 7 different filesizes in 7 different places" issues that had managed to not show up in the files I'd spotchecked. That's working now, as far as I can tell. I posted a v3. It's strictly optional.
Also, since the genie's well and truly out of the bottle, I'm not going to pretend that my copy of d5480a26b3dea3dda37abd1b61fb47cd actually has anything useful in it. Removing all of its (already disabled) contents means that the main patch is down to a lean 3mb (as a 2.7mb rar file), versus the old version's 17.3mb (as a 5mb rar file).