I could honestly see someone making one fit a Nikon, however not a Canon.
The reason why is Nikon and Pentax have similar Aperture control method. So a conversion would just involve moving it to the right location, and moving a few electrical contacts.
However Canon's system is entirely Electronic.
I really wish that Sigma would introduce more EX primes, including something around that range, an 85mm, and a 135mm.
I've heard of mods being done to pentax glass to fit an Canon body. However, the mod is permanent and it won't meter or AF IIRC. You will get infinity focus though if I'm remembering things right. That said, I'd be hard-pressed to put my 43mm through the procedure.
Provided you accept manual aperture control and focus it should be straightforward... Will have to open the lens manually to focus then close to shoot though...