Weeping Pussy willow unhappy in pot.

Received a pussy willow in a pot 4 years ago, repotted it & seemed happy until this year. I'm nervous to plant in the ground of my medium size garden as I heard how thirsty the roots are. However, I live opposite a public park, with a few giant weeping Willows growing along a Stream in the far section, the stream runs under a 'football pitch' (which my house overlooks from a steep slope). The pitch is flooded most of winter so is only used by kids in the summer). Can i guerilla garden and put it there? Not on the pitch, but just up from it- there are a few other mature trees on the slope. Thought it could help stop the pitch from flooding. Alternatively can I repot it to try and save it. I can't bear the idea of it dying or throwing it away.
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Can you supply a photo?
I'd certainly NOT go planting it in a public park.
Wasn't thinking of doing guerilla gardening now,
I'd cut it back to that new growth at the top and get it in the ground in your own garden.
They don't get like the big ones you see on riverbanks etc
They're ok in spring with some bulbs underneath, but after that, they're pretty
nothing-y.
We had a group of them at the last house [inherited, not planted by me!] beside one end of the pond, and they were useful cover for the sparrows as they flitted across to the feeders.
Right in the firing line of the prevailing wind.