Good luck, Matthew. It sounds like an interesting story.
Based on my one visit to Macrihanish as supernumerary crew on a Lyneham C-130, you should probably talk to the Campbeltown fish merchants. When I was there, there were several transport aircraft of various sizes, picking up orders of fish, during their "practice diversions".
While waiting for our fish to arrive, the captain kept one engine running, rather than trust the APU, because he wasn't supposed to be there!