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I have done similar for a chip
I used a stone rotary bur tool in my hand drill on slow took a while but didn't get hot or do more damage159088

Baldy had a similar repair done in the search
http://straightrazorpalace.com/razors/45985-does-cracked-heel-mean-razors-dead.html

Definitely saveable there is a few similar threads here for cracks like this that we're scalloped out and made good might have been in the workshop forums
Looks good otherwise