personally will only do with a big rig is dive any site on the main Tulamben beach (where the Liberty Wreck is) on a boat. The Tulamben beach shoreline is lined with smooth rocks, some pretty large, which makes it difficult for ingress and egress for shore diving with a big rig and gear, especially when the waves get a little choppy. Moreover, with a boat diving the wreck etc, you can finish where you want and just surface, instead of having to swim back to a particular point on the beach.
Might be good for a dive around the wreck itself but I would rather start from the shore for a nightdive, the most interesting part is the wreck slope east of the wreck and the shallow beginning allows interesting encounters like blue ring octopus, cowries or various nudibranches you don't find on the black sand for instance.
More over when I end my nightdive at 8PM I'm quite sure I'm at my hotel already showered at 8:15PM, while it probably takes 20-30 minutes more from a boat.