Sorry, I misunderstood what shorthand meant. I thought the question was whether there's a complex variant, like 一 → 臺 for 零.
I'm an ESL speaker, so please forgive me.
零 is the only character, as far as I know. 一, 二, ... are not shorthands; they're the original characters, while 臺 and other more complex forms are used only in certain situations where necessary.
Because they somehow didn't outgrow the cringe iamverysmart and iamverydifferent phase of young adulthood. Probably because they are well off and never had a struggle in their life which makes them such a bore.
Koreader supports Calibre wirelessly, so there's no need to ever mess with a USB cable again. It also has no telemetry, does not nag about unregistereded device and, doesn't force you to give up Wi‑Fi(there are quite a few websites designed for ereaders). It can read RSS, natively supports EPUB, and offers a custom dictionary, custom screensaver, custom status bar, and a better horizontal mode, including columns.
I've been avoding messing with my Kindle when I was doing the same thing; not registering and using Calibre. But the latest news gave me a reason to try and I regret not doing this earlier.
Laughs in Libreoffice Calc