The thought is to use tungsten plate (billets) in the range .250" -.125" To re tip drilling bits,
Unsweat broken inserts and rebuild bit profile (Mig/Stick)
Rough grind to shape
Cut new inserts Plasma (slight oversize) and sweat in
Grind bit to profile/rake etc with Diamond wheel
The cost of a New Bit 8" 4Way Chevron 4/1/2" Reg API =$1200 (May GET 200 Meters out of it if your Lucky)
Scrap tungsten/off cuts can be broken down and used to re tip diamond drill bits

Your Thoughts