It's really not realistic to run through jax to get morgana especially since morgana is not a hero that needs to stay near the fight all the time. Running to her while she has support is near insane since she can cast her cc on you. And you are most likely behind the front line at this point with their team focusing fire on you.
As for Ryze, his spell is very situational. If there are creeps around, good luck with the ult. If jax has boost, again, good luck. This is not to mention that you have to get way too close to him for the ult to bounce back between you two. You will no doubt get destroyed faster than your ultimate kills the spell shield. Not to mention you actually need a ryze to do this.