Start with 6000 series 1″ dia. aluminum rod cut to fit your hand.
Slot one end and drill one 5/32″ dia hole to receive reciprocating saw blade. Drill three 1/4″ dia holes and tap all the way through the rod. These will receive 1/4″ x 1/2″ long stainless steel grubbing point set screws to hold reciprocating saw blade or other tool that will fit the slot. I disassembled some old pocket knives that I mount the blades to this end.
The other end I drill a 1/2″ diameter hole to remove some weight and mount a 1/2″ dia x 6″ long ferrocerium rod. Drill one 1/4″ dia hole and tap all the way through the aluminum rod. This will receive a 1/4″ x 1/2″ long stainless steel grubbing point set screw to hold ferrocerium rod.