You can get a flange that is fastened into the concrete, then the rail sets into the flange and fastens with a setscrew. The flange should be available at any place that sells the railing.

Thank you. I'll look for them.

The local rental yard should have the coring drill and core bits to easily remove the old section, and bore a new hole for a new one.
The surface anchors are a very weak method for attaching railings.

You have at least a 30 inch steel lever to rip the anchors out of the concrete with.

It worked.