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Expensive solution but I like it!

A 'bush winch'? Some sort of arrangement that goes on your wheel nuts, Jack one side of the truck up and have your wheel free spinning

Get a 4wd ground anchor then you can use it in two places!

Have you looked into climbing rope? Found need static not dynamic it's not cheap either though

I picked up a 9tonne 20m one from somewhere. Just remember to use decent shackles and a cost/dampener on the winch line

Not that much if you know the right people!! Didn't pay that much but it's worth it not to get wire splinter spikes

Cant just use an extension strap/rope? I swapped mine to the dynamic rope stuff and got the original wire crimped so I got an extension, then with all the other buts I got bout 80m