True, volume 12 can be problematic, however, quarterstaves can be made pretty simply (you can ditch it if you need to), work with 2 of the the 3 major martial arts that have explicitly allowed weapons (Niten ichi ryu and Silat), have bash 23 and allow both parry and rapid strike. I usually stick with my q_staff until I find or make a decent sword.
I also think that would be cool if you could use the rifle holder to ‘sheath’ your quarterstaff, or build some other form of sling-over-the-shoulder to hold it. 
Hrm. I guess you could try equipping a fist weapon (punch dagger/steel knuckles), afaik they use the unarmed skill and so should keep your hands “full” and still give you complete access to Krav Maga?