Well, it could be possible, if you were to get approval. Let's say you make Liquid A which I will dub Llama and it is a 50/50 mix with 12mg nicotine, and you get it approved as such. You will have to make Llama in large batches and each batch will have to be tested, and records kept, proving that it is exactly the same as the Llama that was approved. You will also have to ensure that the packaging that Llama goes into is exactly the same as the packaging that Llama was in when it was approved. Then you could sell this as a final product to consumers.
This means that you have to control your supply line to ensure that the components of Llama are always exactly the same as they were when you got Llama approved, and that means everything from the PG, VG, nic, flavoring components, bottle, bottle cap, label, label colors and fonts, packaging, etc.
Each bottle of Llama that is available for sale has to be identical to each previous bottle of Llama.
The chances of you actually getting approval are a separate discussion, but we can get into that if you want.