Is it possible to use the Microchip Graphics library for a Single Color GLCD?
You can build your own graphics "driver" that integrates seamlessly with the Microchip Graphics Library, for any graphics LCD you have. I was able to use the graphics library with a different type of color LCD that the library did not support by default.

The process is as follows:


Download the Graphics LCD library from microchip
Make a copy of an existing "driver" code file/folder (I'm not sure if I found the exact files/folders, but you get the idea)

see Lib\Object Layer\Configs\XXX.c and Lib\Primitive Layer\Configs\XXX.c
see Lib\S1D13517\

Modify the code to reflect the exact protocol the LCD needs (refer to its datasheet)

Typically serial and parallel LCDs are supported (for parallel LCDs, the PMP / Parallel Master Port module is useful)
Start with the "init" function, and be able to send the commands it needs to initialise
After that try sending commands to set a pixel, which will be used to draw lines, curves, rectangles, etc
If the LCD supports accellerated primitives like lines/curves, then you can modify the driver file to directly send those. Otherwise leave the defaults (uses the set pixel function)
For text, you can choose font to embed in your app and the library will draw text with that font