There's no reason to fear it at all. I've pulled thousands of Alps caps by now and I've never broken a single one.
All you need to do is do it properly. Use a keypuller, preferably a wire puller, and pull straight up. The first time you pull the keys they'll take a bit more force, but they can handle it. Just don't use a knife or screwdriver or anything like that, use a proper tool.
The only problem with Alps caps breaking is when they get hit from the side, for example when they're being shipped - in that case Alps caps can sometimes snap clean off.