Fortunately for you lot, I happened to make an easier cg unlocker for myself today.
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Remove _ from the end.
Press ~ in the main menu and it should unlock everything. There's actually a built in way of unlocking everything but it requires pressing a certain key combo in the right spot in the right event.
On a side note, it seems that the animation frames are atlased in a weird way when I extracted them, and it'd be appreciated if anyone could help me figure that out.