If you swap two lines around in the struct you could just do:
sliderButton_t button[10] = { {50}, {84}, ... and so on.
byte xEEPROM; // EEPROM adresss for stored value
int xPos; // Stored value for X position
Becomes:
int xPos; // Stored value for X position
byte xEEPROM; // EEPROM adresss for stored value
Unless you are relying on the position of each item in the struct then the above would work fine.