You can dedicate that twin plug series charging harness especially for charging. So the main power cable that connects the battery with the ESC can stay and doesn’t necessarily to be unplugged (though I believe it’s best to disconnect everything from the battery while charging). Just added convenience.
So I’m in a similar boat where I don’t quite got a great plan for my setup. 5s 4000mah x 4. I bought a HTRC 80W B6 V2 RC Balance Charger Discharger with Power Supply 15V 6A AC Adapter and trying to think my best choice is. (Fastest/safest/with lipos)