The highest-tier conveyor belts from K2 do not require loaders. Furthermore, these K2 belts are the fastest available in the game; it is recommended to use them, along with K2 endgame materials (such as Matter).

I will look more in to compatibility with other mods that add new belts etc.

Apex belts remain optional as a capstone ability in the current version and currently matter is not a resource I factor in. I am happy to try and make this mod as broad ranging as possible so I will try and make some time to understand K2 and how this mod could integrate.

My knee jerk reaction would be adding a warning when selecting to unlock apex belts with k2 installed gives a warning message and confirmation. We'll see, I appreciate the feed back, thankyou!