Not been that unlucky to be faced with threadlocked hub nut to date, however, like you have lost a number of 1/2" drive braker bars due to nuts not yielding.
Now use a 3/4" drive version and also a scaffold tube over the top of the bar.
Also worth checking that the nut is un-staked before attempting a loostening technique.
The last hub bearing I chnged last week, the nut spun off quite easily using my nut gun, but the hub bearing had collapsed and the inner race had siezed to the spindle, so 3/4 of the removal went ok, that last part required the mini grinder and hammer with chisel to remove the remainer part.
My advice is as above, but be ready for more issues especially if the bearing has got hot/noisey as the inner race ring may well be the same as my last one I replaced.
Also, after unstaking this nut, maybe try borrowing a decent electric nut gun, they usually yield, unless damaged threads have locked the nut solid.
Good luck.
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