As weird as it sounds, you can let the slide slam into battery on an empty chamber if you are holding the trigger pulled as you do it.
While the slide is open, held by the slide stop, pull the trigger and hold it tightly. Release the slide. When the slide is fully forward, release the trigger.
If you want the hammer down on an empty chamber, the final thing to do is to pull the trigger again.
If you want to feed a round out of the gun's magazine, the only truly reliable method is to release the slide and let it go all the way forward uncontrolled. This cannot harm the sear, because the act of feeding a cartridge slows the slide down enough not to jar things.
However, if you still worry about the sear, and if you carefully point the pistol in a perfectly safe direction, you can do the "pull the trigger" trick here, too.
In this case, your final act must be to push the safety lever up, to "on," rather than to pull the trigger a second time.
Only then may you raise the pistol and point it at something you want to shoot.
The reason that the "pull the trigger" trick works is that it removes the mass of a couple of good-size pieces from the trigger-sear-hammer train. Less mass in the system means you've removed the likelihood of jarring anything off. The disconnector does its job, so the process is perfectly safe as long as you remember the correct sequence.