Is the gShield not repairable?

I'm not 100% certain this is possible at the moment but have you thought about using the Arduino with GRBL firmware to connect and drive external stepper drivers. I've got 3 Leadshine AM882 drives connected to a Arduino Uno at the moment, just for test purposes. I can drive them with code from the Arduino. This weekend I will try to drive them with the GRBL firmware and the GCode sender software. If you can wait that long I'll let you know if it works.