This post shows two WiFiChron mods, that look more like finished projects rather than just experiments.
First one uses the WiFiChron board connected on I2C to two Adafruit Quad Alphanumeric Displays (I2C addresses 0x70 and 0x71). The WiFiChron software has similar adaptation as the one for HDSP clock (see this post for details).
This (poor) video shows it in action.
The interesting thing about the Chinese clones (of the Adafruit displays) I had in hand is that each module has one (2 digit) display red and the other orange. Initially I thought it's a manufacturing error, but after checking, it seems that this is intended (for reasons I do not understand).
The second one is an "HDSP clock" with a 8-character display with 16-segment LED modules, introduced here, cased in a LEGO enclosure.
After cutting the top of board off (since there is no HDSP-2534) and a little filing of all sides, the PCB fit perfectly between the LEGO bricks.
For this display, the line that has to be enabled (un-commented) in DAL.h is:
#define DISPLAY_HT16K33
