Any way you can get that ripply canvas tightly attached to a flat surface will work. Just be aware that in cases where you are printing monotonic colors like clear skies over ripples, there is some chance the ripples will slightly band the coloration. That's going to be pretty subtle and never shows up in textured areas, but in pristine skies you never know. So if possible load the ripply sheet or rotate the printing file to put the ripples under textured image areas. But all you've got to lose is about $6 worth of ink, it's a good gamble.
You get a shorter length of ripple-affected area on canvas that comes on 2" rolls, which I believe is why Epson switched over to those recently, and why Sunset Select should do that soon. And yes, BC's padded cores let you work to the last inch, although in some circumstances when the canvas comes entirely off a roll during printing it can re-attach the emulsion side of the canvas to the tape with a pretty strong bond and mess up whatever's printing a couple feet ahead. You should be attentive to that possibility as you get to the last wind layer.