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Success!
Thank you all for your help and tips! In the end I think the combo of using the lighter to apply some heat as suggested and some more wd40 helped. I had a friend clamp the washer on the NDS to apply some counter pressure, then I twisted it off with an adjustable spanner.
The bearings are absolutely shot, more dust and rust than grease. But thanks to your help I can service it now. Thanks!
If you have a large Allen key or similar, something I’ve done at home before I had more tools was to fit an Allen key or similar between the cone flats and the inside of the freehub body, immobilising the cone. Then turning a wrench on the NDS to spin the axle and undo the freehub cone all the way. Once the axle is free of the hub you have more options to remove the stuck nut. GL!