I pierce them buddy. I've been using them for 3 or 4 years and never had an issue. As long as you use a fine baiting needle and take your time you'll be ok.
You now have the crushed cork hookbaits available. I actually prefer them because they're as buoyant as a cork ball, they can be trimmed, you don't have to worry about birdlife, there's more basemix to hold the liquid cure..... really good baits.