It's not the safest thing I've done and for legal reasons would never recommend it, but I've done it too: slow and smooth. Of course I've only deprimed maybe 30 live primers in my life, so 125 might significantly increase the chance of ignition. I suspected a universal decapping die would probably be the best choice in case one did ignite, since there would be no seal at the case mouth or around the case body. Furthermore, if one did ignite, the ram on my Lee Classic Cast Turret is hollow and would direct the primer cup down and not out the side.

One can't completely eliminate the danger, but there are ways to mitigate it. This seems to me to be one of the hallmarks of reloading in general. The rest is the reasonable assumption of risk.