An easy way to deal with that is to write a script that reads your BlenderCAM G-code and converts it into geometry such as planes. Then you can use software like KUKA|prc to simulate it and convert it into robot code. The free trial version of KUKA|prc does generate KRL code, it just doesn't contain some advanced features such as support for linear axes.
If you want to convert your code directly into KRL, our research should be able to help you with the math: http://www.robotsinarchitecture.org/robarch-publications
If you're only doing three-axis processing it's even easier - you just export the toolpaths as a polyline and place a plane at each control point. KUKA|prc then takes care of the conversion. Let me know if you need help with that.
Best,
Johannes