Again a bit tin pot, but how about selling off the playing surface in say a square meterage.
Using Google, the playing surface is 6,400 mtrs. Selling each mtr at £25 should ( if all sold) raise £160,000.
Each "owner" could be issued with a plan of the ground with their name in their particular square.
Or
There must be someone out there with th knowledge to produce a map of the playing surface divided into squares with the "owners" details. This could then be made available to print via the gmfc website and would incur no, or very little to the club itself.