I'd recommend indoors, except for case cleaning / bullet casting (as already noted) as these are potential lead dust generators that shouldn't be done inside any house. And reasonable precautions, such as dumping media through the media separator outdoors
, should still apply even though most of the case cleaning can be done inside the garage.
And, to solve the "security problems", I'd store everything in a closet. A Workmate can support the reloading press, and everything else can be stored / operated on closet shelves. Change the lock to an exterior lock, and make sure the key isn't accessible.
Earbuds let you listen to music without disturbing others...