Drill it. My old Donahue with same fork came home drilled (shoddily) and worked perfectly.
Get a mate with bench drill to do it to get it done right. Measure twice, drill in steps to get to the required 6mm front, 8mm back (iirc).
I drilled a carbon Dolan fork with alu crown back in my uni days with workshop access. Didn't do a die.
Bench drill essential IME. Tom Board built me a beautiful replica of a much earlier Cedric Clayson road/track bike. The fork had Columbus round blades in a flat-topped crown but he drilled the brake hole a few degrees off. It worked but...that fork has been in the spares box for a long time!
Drill it. My old Donahue with same fork came home drilled (shoddily) and worked perfectly.
Get a mate with bench drill to do it to get it done right. Measure twice, drill in steps to get to the required 6mm front, 8mm back (iirc).
I drilled a carbon Dolan fork with alu crown back in my uni days with workshop access. Didn't do a die.