I very recently bled my brakes, starting at the furthest (rear) caliper, I realize they have different reservoirs and are basically 2 systems, but they do share the ABS, I used a vacuum brake pump bleeder and removed fluid until I had clean fluid at all calipers; then I pumped and bled as a normal system, being very careful to always have fluid in the reservoir covering the hole leading to the hose. Usually one to two cycles using the pump, bleed method and I had a firm handle with good brakes. In the GS-911 there is a section for the ABS and electronic "toggles" for testing the ABS module, found it when I first got the GS tool and played with it a while, but I wouldn't worry about trying to bleed the ABS valves, clean DOT4 to all calipers is the key. Also, you don't need to buy the brake fluid by the quart, the pint is plenty, once opened you only have about 1 year shelf life (max), it's very hydrophobic (probably miss-spelled, it absorbs water) so limit exposure to air as much as possible.
When I first purchased the vacuum bleeder I went to you tube to pick up pointers, there is a lot of good information there on bleeding motorcycle brakes, ABS and non ABS.