If the O.P. should happen to purchase a 1938 Royal Enfield KX 1140 with a worn clutch centre, he'll be able to fix it even though the new part hasn't been available since 1953.
I'm impressed by self-reliant people.
Looks like a great job.
I did one once. I coated the outside with Casite hardener before I heated it to medium red and water quenched it. I had to work the bearing surface down a couple thou to get the bearing on after I obviously got it too hot. I had used some stainless exhaust tubing for a shield.
Mine is still on the bike after a couple hundred thousand using steel plates. It is showing some wear but it's still working.
And I still have a scar on my arm after some of the Casite slag got between my glove and my sleeve when I quenched it. Jim