Near the bottom of this sites home page you'll find a 'review of eight personal survival kits'.
One is 'Ranger Rick's Special Ops Survival Necklace'.
It has some good ideas (like a wire saw as the necklace)
And one handed fire starting; there's a reason Doug has a one handed fire starter in his kits. It's a survival kit: you might have a broken arm.
Other good ideas on Ranger Ricks site and all priced very reasonably.
qjs