I’m no expert but something I would consider doing myself is to screw another nut onto both the stuck NDS and drive side nut to give you a wider surface to get a tool on to without slipping... if you have something that would suit... also, have you tried tightening the NDS before trying to loosen it off? Sometimes works... otherwise why not take the DS nut off and tap the whole axle through to the NDS and out of the hub - then with only the axle and stuck nut left you can soak it in WD40/heat it etc and see if that works 🤷♂️
I’m no expert but something I would consider doing myself is to screw another nut onto both the stuck NDS and drive side nut to give you a wider surface to get a tool on to without slipping... if you have something that would suit... also, have you tried tightening the NDS before trying to loosen it off? Sometimes works... otherwise why not take the DS nut off and tap the whole axle through to the NDS and out of the hub - then with only the axle and stuck nut left you can soak it in WD40/heat it etc and see if that works 🤷♂️
(Obvs also Take the freehub body off)