The major problems with inlets worldwide is they constantly undergo changes due to severe weather. Sand bars shift, some inlets silt in completely and cutbacks in federal funding has limited maintenance dredging to just once in a while instead of routine dredging. Consequently, you need lots of direct, visual information in order to safely enter ANY inlet, let alone an inlet that you are completely unfamiliar with.
Now, your boat is well equipped for cruising, with one possible exception--broadband radar. Broadband radar will allow you to see and identify some of the more common markers used in small, remote inlets. I've been through some that use nothing more than stakes pushed into the mud with an aluminum pie pan nailed to the stake as a reflector. Others use just stakes alone, and some had strips of rag or ribbon attached so they could be seen at greater distances. These markers were placed there by commercial fishermen who frequently run these inlets during hours of darkness.
You cannot depend upon the USCG to reset channel markers when the channels shift. A good example of this was the southern end of the Havre de Grace Channel in the Chesapeake's upper reaches. Tidal currents from hurricanes had shifted the main channel bar near 100 feet into the channel across from a popular swimming area known as the Sand Islands. The bar had shoaled to less than 3 feet, but charts still show the depths at 12 feet. There were loads of groundings there by sailboats until this past year when the CG moved the buoys to the west end of the bar. They don't have funds to the channel, it's much narrower there now, and the channel is heavily traveled by tugs pushing barges filled with quarry-stone. My point here is that if you were running the narrow channel at night and relying on your charts and GPS plotter, there's a good chance you would either hit the unlit buoy or run hard aground in a heavily traveled commercial area--not a good scenario.
Unless it was an emergency situation, I personally, would not run through an unfamiliar inlet--especially under sail. Instead, I would wait for daylight by heaving to at a nearby offshore location, then when conditions are right, tide, light level, etc..., I would make for the inlet and keep a good vigil on my GPS and depth finder. And, because most GPS plotters provide you with a trail showing where you've been, I would save the trail information in the GPS memory so it could be used as a reference in the near future.
Talking with the local Tow Boat U.S. guy on the telephone can be a major source of up to date information, and as stated above I highly recommend this. It could save your boat and possibly your life.
Play it safe,