I would find one of the pastors, explain you dig for bottles and would be happy to make a donation in exchange for access to the site like NHpharm said. I would be very surprised if they said no.
Hey Leon, I hear ya. The window of opportunity is small at these kinds of sites—sometimes I get just hours to get into the hole and explore before the next crew seals it all back up again. Looks like you salvaged a good number of interesting finds tho.