Presuming you mean the Hereford/Welsh wye I have done exactly what you are doing. The fishing was discreet. I dont think a whole river ticket exists but the wye and usk foundation offers day tickets for many stretches but as your in a canoe it wouldn’t work. I have canoed it without fishing a hell of a lot, and do fish it occasionally through the w&u foundation when not canoeing, a magnificent river, my most favourite. My advice being both a fisherman and canoer would be to do the two separately