You know, I’m not really sure with ART. Fuse characters and Autorigged characters can be exported through our website on a UE4 default skeleton, so if you can load in the UE4 skeleton with ART, I don’t see why it shouldn’t work like a charm.
I think I’ll spin up ART for myself and take a gander 
BTW we opened the flood gates and now all characters uploaded from Fuse can be autorigged and downloaded for free, so that’s neat \o/
(more info: http://blog.mixamo.com/celebrating-mixamo-2.0-with-free-fuse-3d-character-creator-auto-rigs)