Might sound weird, or gross, but when I've had narrowing/stricture issues, if I sit with my butt in my sitz bath, with pretty hot water in it, somehow it relaxes everything, and I can pass stuff into the hot water much more easily. 

Worth a shot, anyway.  Works for me. 

Warm water tap enemas can also help. Just insert very gently and release the water very gently. MY GI has approved this method for me on occasion when needed and I find it really helpful to release the residual stool that is at bottom of pouch and getting blocked by stricture. I purchase fleet enemas, rinse them out well and fill with warm water.