I can think of two alternative airfields, although sadly neither very local to you.
(1) Lee on Solent, near Portsmouth has ramps still in place from when it was a Navy establishment testing hovercraft.
(2) Stoke airfield in Kent is sat right next to the old "Medway" seaplane airport. I've heard from the airfield owner that he's been trying to see ways of ressurecting it as a seaplane operating centre.
Both sites, have some degree of maintenance presence and (to me anyway) helpful management. Lee is probably your best bet, just a shame it's about as far as you can get from you whilst staying on the mainland!
Incidentally I'd be very reluctant to hover a rotary over a FW without removing the wings first - just asking for trouble.
G