Manufacturing Using Partial SKUs

We have a client who sells 4-packs of 4 different soda flavors. They have a 12-ct variety pack that we need to assemble that has 3 of each flavor. Currently, there is no way to do a partial SKU in the manufacturing module, so we have to recount their SKUs down and recount variety packs up and charge manually. They don't sell individual units and they're received in 4-packs/8-packs/16-packs, so it doesn't make sense to treat them as individual bottles in the system from a SKU standpoint. Not sure how it would be managed, but it would make sense to set up the kit as containing 3/4 of a 4-pack SKU, and then when you entered a # of kits to be manufactured it would just have to equal a whole number for each SKU that is a part of the kit. So, in this case, each kit gets 3/4 of a 4-pack, so the system would force you to manufacture in multiples of 4 to make sure there were not partial 4-packs left afterwards.