Swanborough is actually further and the approach less kind; nick is a gent though. Deanland do welcome visitors or at least i havent had a problem but i agree a da40 is not the aircraft to visit in.
Shoreham is your best bet, and thence a cab or train into brighton and a bus to belle tout, i think there is even one that goes past or the coastal service to eastbourne gets you a short and very pleasant walk to belle tout.
It would make a pleasant day out.
(from my time in da40 no problem landing but the departure would be interesting cant remember the performance figures mind you)