I suggest creating a second column, but instead of going with Title and Subtitle, go with Title and Short Title (or something like that).
So using your example, the Title would be:
I am happy: And this book contains all the reasons why you should be pleased
and the Short Title would be:
I am happy
Redundant information? Sure. But it gives you a short title for saving to disk while preserving the ability to download metadata with the full title.
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