prsp.sh looks fine.
I'd chain up commands like this:
cp /Data/fonts/tt0003m_ttf /tmp && cp /Data/fonts/tt0011m_ttf /tmp && cp /Data/fonts/tt0419m_ttf /tmp && mount --bind /tmp /opt/sony/ebook/FONT && mount >> /Data/mount.log
This way if copy fails, you won't "bind" it and you get a log with what has happened.
You can't break anything, if something goes wrong, reset boot in "safe mode".
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