Can you connect it to the serial port?
Try to find out it's baud-rate and try to set the empeg to the same.
then run /bin/bash < /dev/ttyS1 | blitoutput
You probably won't see what you type, but the output of commands will be visible. so typing "ps" will show the currently running processes on your empeg's display.

I do not know this kind of keyboard; I was more thinking of an IR-keyboard to do the job. Maybe some win-CE device will work over IR

Frank van Gestel