Looking for adapter for Samyang 85mm in Nikon mount

I've been thinking seriously about upgrading to Nikon F-mount manual focus glass like this. I think it has some compelling arguments for it. Not only can you get high quality optics but you can use a lens like this on just about any camera, including Canon EOS, using just a cheap adapter.

I've been using a Rainbow Imaging adapter for the past two years with my non-Ai Nikkor-S 50mm 1.4 and haven't had any issues. I don't see why it wouldn't work with the Samyang.