its pointless using any cash.
The plane is likely in 75 plus m of water off the North of Alderney.
Guernsey Harbour Master doesn't have access to the hardware to find it. To find it will take a few days with a side scan sonar. To lift it will need 2-3 days with a saturation equipped diving vessel which will have to come down form the North sea. Your looking at half a million. AAIB won't pay for it and neither will Guernsey. And to be honest nothing will be solved if it is found and lifted.
Personally if I was the pilot I would want left down there.