KH question

What I was suggesting was shim stock as the running surface and the epoxy as the filler and adhesive beneath.
Actually better than shim stock would be some Brown & Sharpe. Cut and fit it, then harden it.
Look it up as oil hardening or water hardening steel.

Cut it something like the dashed lines and it will be mechanically trapped once installed.
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But don't give up on welding or brazing just yet. Call and make some visits.
When I needed a exhaust manifold welded down here, it took a little hunting to find the right guy.
One place wanted more than I thought was fair price and another shop, different location, was super reasonable. I think part of it was location and part of it was he could just slip that job in amongst the other jobs he was doing. Different overhead and different type of operation. Both places could do the work equally well IMO.

There's some good welders here who can prob advise if brazing is an option for filling and resurfacing here. @Sublime one