I use fbx2gg, but it could be done with fragmotion apparently, with much more effort and frustration, lol. Unfortunately, at the current time most fuse models need to be decimated to be usable in gg. Adobe took down their decimator tool. (At least I think they did, they were going to in august. I'll double check). So right now things are kinda at a standstill as far as that goes. I haven't messed with it in a while. Hopefully the fbx import will allow for those higher-poly characters without the need for it. As far as adding gg animations to those when the time comes, I really don't know how to go about doing that.
Desktop: i7 4770@3.4Ghz (passmark 9809), 12GB RAM, Win 10/64, GeForce GTX 1080 (passmark 12006), 1TB SSD, 1TB HDD; Laptop: i7 4800MQ@2.7Ghz, 16GB RAM, Win 10/64, GeForce GTX870M , 1TB SSD.