I recently found some nice 14-segment displays
on eBay. They use a HT16K33 driver chip; I2C interface.
Here is a spin program complete with a font and a couple of photographs.
I'm not sure why I keep looking at 14- or 16-segment LEDs. Matrix displays are easy to work with and support much nicer fonts.
Re-inventing the wheel is not a waste of time if, when you are done, you understand why it is round.