You're joking, right?
The filament will break even if the friction fit holds the pins, which it won't. Why in the world would you consider doing such a thing when it's your life potentially at stake?
Pony up the dough for a known-reliable solution. Your life is worth it.
(On the other hand, if you want cheap + reliable, buy two Photon microlights, and use outdoor double-stick foam tape to attach them to the stock or pump handle. Squeeze them as needed to light up the area. Works fine indoors.)