If you have the bolt pattern you could always make up some plates with threaded bar in to bury in the concrete?
If not I am a fan of chem fix
It's the only thing I'd trust my life hanging on in rope access. They do sell an instant mechanical fixing, sod that.I'm a big fan of chemical fixings, normally Hilti HY200 is what we use at work.
Lifting 5 tonne sections of concrete 100m up above public pavements you don't take chances. I did several rounds of pull-testing and they always passed. 16mm studding with 150mm embedment still holding at 9 tonnes.