This is drastic sh1t, but when in trouble give anything a go..
A) No WD40? Get oil off the dipstick, keep smearing on a rag/tissue etc and rub into and all around the seized nuts.
B) Have a look around, theres got to be a builing site around, if there is ask for a loan of scaffoling tube, the longer the better, maybe 500mm to 1m length, fit the brace to the nut, slide the tube straight over and down tight to the "L" part. Try and keep the angle of the brace/tube pointing up at about 30 degrees ie towards the wing mirror. Law of the lever, given a long enough lever and a well positioned fulcrum, the rest is history.
C) Maybe jack up the wheel, not too high, load of car may be come off the wheel and bear on the jack, enough to loosen the nuts.
D) Con-saw, semtex?
hope it all works out
D) Force = Mass x Acceleration, big lad ( Mass ) with foot firmly on brace, good "bounce" ( Acceleration )