Banjo_oz: Thanks. I'm on it. :) Will let you all know how it goes.
Edit: isolated all the changed 1.0.5d files to revert (the only completely new ones by the borked patch are in "dlc" folders that can be deleted) and will test tomorrow if overwriting reverts the game version.
gog2002x: If you can succeed in that, you'll be a hero. :)
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Okay, I think I've done it.
Made my custom patch, installed it over the latest version, started it up and it seems to run okay. The outfit challenge options are gone from the extras menus, which bodes well that if things are working but those are gone, it is indeed "reverted" to the previous 1.0.5d game version.
I want to be sure before sharing this, however. Even though testing this will be VERY much at own risk (I take no responsibility for messing up your game and requiring a reinstall, or losing any saves/progress) I would prefer to be fairly certain I've not broken anything doing it the way I have.
So, what is the quickest way to know which version I am playing (bugged update or previous good update) when testing? That is, how do I best check if the issues from the patch are gone? Aside from if the new outfit options are there or not (they're gone), since I can't find an in-game "version number" anywhere, even in the credits.
To be honest, I've not played the latest update versions so haven't experienced the bugs reported myself... so what's a really obvious one I can check for without having to play half the game first?
Something I'd really like to know is are any of the cutscenes and music tracks different in the latest update? I ask because the CRCs have changed for the HD OGV videos and OGG music files, but they all seem to be identical at a glance... and leaving them out of the patch if not needed would *drastically* reduces its file size. Does anybody know?
As soon as I can get these answered, I can share my work and hopefully help folks out with this!