I wish I could be of more help. I don't have my SD reader yet to play with, but since they only uses 4 digital pins it may work as well as the NFC reader? With the NVRAM being R/O at runtime, it looks like the SD card would be the only option.
The temperature sensor had me confused; it's not intrinsic to the displays operation I imagine. So, would this work, with an SPI interface and their library? I only want to display text, and it doesn't have to be updated that often.