For these inexperience with avrdude, it would be nice to provide ability to upload file to EEPROM. HEX and ASCII view would be nice as well.
I believe there is some relevant discussion here:
Using EEMEM may be relevant only if EEPROM data are changed all the time when flash programming memory, but not in case when:
1. There is data length near or maximum to EEPROM. Keeping them inside .ino or separated .h is not practical for further manipulation (editing).
2. If already saved data in EEPROM should not be changed (sensor reading, user defined config, etc).
Thus it would be as well interesting ability to read data from EEPROM and then save it to a file.