[flatheadmurre]

Plating if the pits are deep will cost....you pay by the thickness needed.
For spraywelding you got coldspray where the sprayed on material doesn´t melt the original...just fuse into the surface....and there´s always a risk it will flake if something goes less then perfect....but won´t distort the shaft.
Hotspray fuses the sprayed material togetter better but the more heat the bigger chance of a warp.
For it to fuse well the surface needs to be clean...grinding it down and spraying on new material works better then trying to fill pits from my experience.