On top of those modern ferries place BVI customs on board to preclear passengers or even better put KIOSKS for customs clearance onboard the ferries or at the STT ferry terminal to preclear. If I can clear Customs in many places in the world by Kiosks or a smart phone app the BVI should be able to figure it out. The cost savings would be huge with the personnel reductions. If I can waltz into Israel without speaking to a customs agent I think the BVI can make it work.