I recently visited Cockerham and the Black Knights by road to enquire if I could use the Cessna to visit my old dad in times of urgency (he's very old now), but they weren't interested in anyone disturbing their commercial operation. If you get luckier, I'd be really interested who you checked with.
The best option I can think of is St Michaels. I've been there by road too, and although micro-based it has 3 runways, the longest 450m. I believe they would be more welcoming, and are even in the AFE guide.
Very interested in how you get on. Good luck.