I have a collection of very thin, flat, spring steel items that I've used for these. I think over the years I've only broken two and that was going back in, not coming out. I have a lock pick, X-acto blades, a couple of machining rulers. They allow you to get in really close and put a measured amount of pressure in the right spot to pop them out.
I haven't had to do this lately, but I was also thinking the next time I do, I would like to see if some amount of heat (like a hairdryer - not enough to melt the items, just enough to improve flexibility) might make it go easier with less stress on the parts.