It's not that tough.
Look at the third photo that Drew posted.
That's what you want to avoid.
See how the black pigment in the epoxy 'bled' into the surrounding walnut?
That's what you want to avoid.
Shape the ebony for a nice fit with your sander, slightly oversized obviously.
Use the blackened epoxy, but seal the adjacent contact surfaces BEFORE applying the epoxy or it WILL migrate into the walnut and you will not be happy
I use superglue for a sealer after I have sanded; then another very light sanding afterwards to knock of any possible irregularities in the superglue.
This way you will get a perfect line. Black epoxy will be indistinguishable from Ebony and Walnut will not absorb any black pigment. I learned this from that school so don't want to attend.
As far as the damage to the checkering, brown epoxy and a V tool will fix that right up. Be careful to apply the epoxy only where needed to keep the job as small as possible.
Don't let it fully harden. Start working when it is about leather hard, just kicked enough so it doesn't gum up your tools. Work fast and get it roughed in; as the epoxy continues to set-up make a couple more passes. Fully set epoxy is hard to cut with a checkering tool but can be done.
Repaired diamonds will be indistinguishable from ths adjacent diamonds.
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