I've said this to people who buy CLP, but anyone who uses AdBlock is not the kind of person who is going to fall for a content locker and fill out an offer.
A very small % of internet users use AdBlock, so it's not something you should worry about. You're much better spending your time finding content people want, driving traffic and testing offers than you are figuring out ways people can bypass the locker. The vast majority of users who fill out CPA offers are not tech savvy so will not find ways round even the most basic of lockers.