Possible, yes. Desirable, no. Originally the loaders were a separate mod. The separate mod existed for the sole purpose of loading beltboxes, because at that time there were no other 1x1 loader mods. Later the mods were combined because it was twice the work to update them both. Now there are multiple mod options available if you want standalone loaders.
In addition it would completely wreck the API that DSB provides to third party mods for making new tiers of loaders and beltboxes and I'm pretty sure none of the people actively maintaining these mods want to poke that hornet's nest.
You can simply turn "Enable beltboxes" off in the mod's options if you only want the loaders to be available.
