Tried that, theres no movement atall with the other nuts removed.Might be worth a squirt of WD40 or diesel on the threads? If you Jack up and support the car, loosening the other 4 might allow you to ever so slightly move the wheel, in turn loosening the damaged nut.
Yeah that sounds a decent idea, theres a wheel with a decent tyre on ebay for £50Buy one of these for less than a tenner. Find the one that fits on the hole nicely but bigger than the nut. Drill through the wheel without using the pilot bit.
Then grind off the damaged bit that is now easy to get at.
Buy replacement wheel off ebay for £50 that has good tyre on it.
Quick and simple and sorts the slow puncture too.
View attachment 851181
As said before I'd be looking at undoing the wheel bearing nut under the centre cap. Hopefully you can get the dust cover off the hub centre then pull the whole wheel and drum off complete , grind the end off the offending stud and knock it through.
You didn't read post 40 then?
Can't do that with the 5 stud hub.