Need someone to Machine out the old steerer from the fork crown so its still straight when done
with a 1.0" drill bit , set up on probably a Big Drill press ,

or possibly chucking up the drill in the lathe and bringing the cut down fork into it.

to remove just the old steerer tube without the crown race being disturbed

takes a bit more heat to remelt brazing material, in a finished heavy part like fork crowns and Butted steerers
than it was to reach it's melting point in the 1st place..