Changing blocks that spawn in vanilla structure

I may have taken on a more ambitious task than i would like to have as a first project and dont know where to start. My goal is getting trial chambers to generate in with waxed copper block variants only rather than unwaxed copper blocks that are going to tick oxidization, mainly for performance reasons to aid servers/SMPS where players are unknowingly in vicinity of trials.  or exploring the world.  while impact is minimal, i still think this would be helpful to larger playercount servers or servers on minimal hardware and my goal is to offer that sliver of performance back without completely disabling oxidization. So my questions here is, is it possible to do such a thing, and if so, what would be the first couple steps to take doing something this.