I hate to say it but I don’t think GregTech alone can do it except through lots of Redstone, so here is some hints that might be useful for that:
Tell the Hopper to output divisibles of 2 (just whack it with some tools or something, lol), then whatever you get at the destination will be easily splittable.
An Item Pipe will send Items to adjacent TileEntities via RNG, unsure how good that is for splitting. Note that I mean one singular Item Pipe Block, not a whole length of them.