This procedure may help:
a. Loosen all spokes to about 3 threads
b. Put the spindle in the hub and put in a jig (so you can spin & turn it)
c. Tighten spokes around the wheel at 90 180 270 360 degrees to make it partially rigid.
d. Adjust the tightness of the spokes to make the wheel round
e. When you have it round, check the off-set and remove the buckle out of the rim by tightening and undoing spokes. The tolerances are about 1mm on the side-side movement.
f. check all spokes ring correctly when tapped.
I've done many a bike wheel but only one motorbike and that was successful with the above procedure.
It takes patience and time and above all approach the job methodically.
Guys with vintage bikes probably do this far more than guys with modern bikes, so you are probably asking the wrong forum !
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Ride on !