Kisslicer can be used, but you'd have to make your own settings for it. We haven't experimented with it enough to distribute profiles.
What is your goal in looking for a 64-bit native slicer, speed? Slic3r's speed has more to do with the fact that large parts of it are written in python instead of C (still a huge improvement over skeinforge, which I believe is all python). Cura is all C is extremely fast, and we have been experimenting more with that. I hope to have Cura profiles ready do distribute soon.