@Scott there are other LCD modules out there. Adafruit sells one 16×2 with five buttons or the one I used (20×4 without buttons from SainSmart) and many others. Just make sure you find one with an I2C connection. Otherwise things get more complicated.
@wdem, I did not;-) I connected the LCD module to the I2C connector of the OSPi board;-) But you could probably modify the cables between the RPi & OSPi to handle both.
root@ospi:~# i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: — — — — — — — — — — — — —
10: — — — — — — — — — — — — — — — —
20: — — — — — — — 27 — — — — — — — —
30: — — — — — — — — — — — — — — — —
40: — — — — — — — — 48 — — — — — — —
50: — — — — — — — — — — — — — — — —
60: — — — — — — — — UU — — — — — — —
70: — — — — — — — —
The 0x27 is the I2C address of the LCD display.
You could probably solder the OSPI cables directly on a GPIO connector for your `other’ module.