These work very well and are JIS, even though the page doesn't say it...their printed page does.
http://www.motionpro.com/motorcycle/partno/08-0146/
Dip the tip in valvegrinding paste, tap them in with a hammer, push in and give a quick twist.
The stock screwdrivers in the tool kit fit perfectly and have a slot for a spanner so it can be used a a T handle also, although you don't get as much leverage.
If they are already partially boogered, I use a punch and try to tap the deformed metal back into the original shape if possible first.
Of course, a drill is the ultimate last resort.