http://dx.com/p/small-sun-zy-717-pen-style-1-led-white-flashlight-red-silver-1-x-aaa-170686
or a tank e08..
https://budgetlightforum.com/t/-/2493
there is also a fake police clone of the tank e08 which is about 3$ it has to be the easiest light to click on ever .Just toss the carabiner and Voilà ...instant hit ..
Give him a real one ...and also a fake so he has another light handy
The BC 10 defiantly has an easy forward clicky