Geoff:
It sounds as though your purpose is to make an express run to the
Caribbean. I believe your proposed
route will be
neither fast nor comfortable.
You cannot clear into the Bahamas at Cay Sal, so must (legally) enter at Cat Cay or
Bimini, then make your Southing.
As noted by Jack , you’d be slogging against both
current (Straights of
Florida at 3 to 6 Kts), and
wind (prefer SE to S, and you don’t want to cross in anything with any North component), then fighting the prevailing winds and currents in the Nicholas & Old Bahama Channels.
Cuba doesn’t offer cruiser-friendly* coastal-hopping, even for Non-Americans.
Cay Sal is mostly shallow (except at the Blue Holes), so you could
anchor almost anywhere, but there are no protected
anchorages.
* You must check in with the officials every time you enter a new port, and check out whenever you leave for another port. At a minimum, this means dealing with the Guarda Frontera, but often also involves officials from
customs, immigration, agriculture, public
health, and transport.
I suggest you take an alternative look at a
cruise through the Bahamas, then South, such as Bruce Van Sant’s “Thornless Passage”.