Just buy a maratac peanut or manker p10 and charge it in there. Nothing wrong with buying a charger even if it is shaped like a flashlight. At least I hope my wife will overlook the purchase
I've charged a few short batteries like that in my Opus C3100 by standing a bolt on top of the battery. Though if you charge often you are going to get tired of that.
There are several charging cords that have magnets for the pole contacts.
The Lumintop GT Nano and the DQ Fairy both come with chargers that screw onto the tube body instead of the head. Either one should work with any 10180 cell one would slip into the body.