You know you have the metal railing kit that you can get from a home center. You have your prefab railing, and the posts, the boot for the posts and all.
One this one you do have to either drill a hole in concrete or use the Remington 22 gun to set the concrete fasteners. In most cases old concrete, one that has cured out and is very old, older than 20 years, becomes very hard and hard to drill and hard to shoot.
Then if you get a good hole for fastening, the metal railings do get wobley very quickly. I have not had good luck with them.
What I would do is: set two 4 x 4 posts just off the step side. Try to position the posts as close to the steps as possilby.
Then go get an 8 foot pre cut pre formed, wolmanized hand rail. Fasten this to the posts or create an off shute for the rail to be more over the step itself and attach with good galv or zinc coated screws.
This will last forever and will hold a about to fall person, where the metal would probably fall off.