Ok combining all these amazing answers, I think this is what I will do:
First I will need to combine my 2 3S Packs in series by either buying a harness or simply soldering them together correctly.
Then I’ll use the VGA port as an one plug solution by soldering it to the + and - leads from the balance plug, as it can be used for charging as well, like @Okami suggested.
That should work as a good solution, right?
Thanks so much guys