Yeah, IDK the ingame coding for the character page, but I imagine that this would have to be modified in order to do what most Really want without resorting to outside apps. As for the outside apps, like you said, the file's basic format is simple enough that it shouldn't take but maybe a day's work to come up with something functional. Something simple with perhaps clickable categories (there's Only 4). IDK if I wrote something up before in the mods area or not, but I do recall at least talking about it.
As for using something like excel, you could import the file using whatever the active separator is (I think it's just a comma), make your modifications, and resave it in the stripped format. The only downside is that these modern apps Love to add hidden characters, so you may Still have to clean it up. What I did one time was simply open it in the notepad (because wordpad has hidden characters!) and do my testing back then.