EGHQ,
The spotter in my wishes you luck.
The architect I trained as tells you 'not a hope'.
Unfortunately, the vultures are already circling. As an operational airport, PLH had the advantage of being so close to the city centre (and I really do think people know it exists). As a closed airport, this advantage make the land valuable for numerous other uses.
You are correct in that you could set up a website for £70 to promote your idea. Or you could invest £15 in a Monopoly set. Methinks the die are already rolling.