If they are open to Helsinki, I wonder if the CTP team might consider giving BIKF a few slots in a future event - not as much as larger airfields because it is a smaller airport, but say 30-40 slots. As Iceland is already halfway across the Atlantic, departures could be staggered out more because they already have a head start. So you could have a departure every 5 minutes for three hours. Since the distance to North America is shorter, we could also take medium aircraft, rather than only heavies, and we could also use the East Apron and remote stands, rather than just the Terminal stands.
This shouldn't affect BIRD_CTR's normal enroute participation too much but it would give our S2s and S3s something to do