For mechanical fasteners thag don’t require any bonding / achesives red heads are what I’ve always used. They also have special screws, all of these I have no problem recomend\ing. The only advantage I can think one of the redheads might have over your current (working) solution is if you used a a threaded sleeve type to allow the “axle”? to be removeable. I’ve used these types for bolting tool stands like metal tube be benders to the floor of my garage. Allows me to have multiple tool mounts that are removeable - lasted 10+years without any issues.