Hi Ed,
I can't give you any definitive reply wrt curl, but the canvases I've used are 'pretty floppy', they show no curl after passing through the printer from the roll, unlike most of the few roll papers I've used. However, if I wanted to do it with your printer, I'd take the risk, buy the roll, and cut it as soon as possible, and store the sheets flat. If there was any curl, it would most likely be towards the core of the roll, and use those last, having had longer in the flat. I guess stiffness would also depend on the coating. One problem you may have, if you don't take care, is dust from the cutting on the surface of the canvas, or embedded in the texture - once you've got few streaky prints you'll remember
.
Best wishes,
Ray