Pervasive Displays [no power displays - e-paper]

Using Arduino Displays
49

For temperature I did that:

#include "Wire.h"
#define address 0x49
#define delayC 1000
#define baudrate 9600

void setup()
{
Wire.begin();
Serial.begin(baudrate);
}

void loop()
{
Serial.print("temperature in Celsius: ");
int temperature;
Wire.beginTransmission(address);

Wire.write(0x00);

Wire.requestFrom(address, 1);
if (Wire.available())
{
temperature = Wire.read();
Serial.println(temperature);
}
else
{
Serial.println("---");
}
Wire.endTransmission();
//end the transmission

delay(delayC);
}

And it worked, the temperature was around 24°C in a classroom.

But afterwards I used the code from repaper and it doesn't need any temperature.

For my matrix problem, I already got a NFC shield, because I'm sending data with an Android Application by the NFC transmission to Arduino, and I'm trying to display those information. And if I get a new shield, I will have problems with my chip selects.
Do you think there are no other possibilities?
Is it possible to write on an .xbm file?