If you look on Numrich, you will see that under SIGARMS --> SP2340 you will see something called "Hammer Box Assembly, SA & DA", which is pretty much a drop-in conversion for the SIGPro, for the not so glorious price of $213.05 US dollars - which means it will be trickier to get across the border. More importantly it would work out to like a $300 part for a $399 gun in Canadian money. Cheaper to buy a used SP2022, and closing in on the price of a new SP2022 by the time you get it here.
I think there is a way to buy the individual parts to convert a gun to SA/DA or DAO, but not from Numrich. Brownells sells the hammer box assemblies for a bit less, but they will not ship SIG parts to Canada any more.
Probably best to just use the gun as a DAO. Anything else is not going to make any sense economically. I have been eyeing those cheap SIGPros on Joe's site too, but the DAO makes it a lot less attractive to me.
BTW, have you shot yours yet? Can you get decent results with the DAO trigger. I can shoot my SIGs in DA quite well, but I can't say as I would want every shot to be like that.