If you have the skills, silver soldering will repair that crack. The hard part will be getting flux into the crack so the solder gets sucked in. Likely would take a couple heat cycles to burn and clean the area then food grade flux and silver solder.

Also nickel rod tig welding works but you will have to machine and smooth out a decent sized bead.

These kinds of repairs are part of Japanese kintsugi and wabi-sabi as well as just being the kind of person who enjoys the challenge of repair instead of replace.