Have a fat friend sit on it and hold the brake.
You send me a ticket I'll be right over.
If it's fighting you that bad, don't put any thing in the spokes, you'll lose them.
Try a tie down strap hooked on the frame near the front foot peg and lay the strap under the rear wheel, wrap it over the top of the wheel back around and under it again. If you got a fire hose, that might work too.
Dollars to donuts, that'll work.