I'm sure container lines are planning a layover so their crews can stay in a 5-star hotel and hit the beach, when they're already two weeks behind schedule. The helicopter thing would be more likely, if the lines were actually willing to pay for a helicopter...
It's actually a thing, and has been for decades.
Well over 50 years in fact.
The options have always been there to pull into the port of Cape Town, or replenish out in the roadstead in Table Bay by helicopter or ship, or replenish on the move whilst going around The Cape by helicopter. That includes passengers, freight, replenishment, etc.
There are chandlery companies in Cape Town that almost exclusively service that need.
Court Helicopters operated a large fleet of Sikorski S61 and S62 helicopters for decades, in a lucrative business, before being bought by CHC in 2000.
Ironically, they started diversifying into offshore replenishment due to the closure of the Suez Canal in 1967. Their first runs were with the Sikorski S-55, before they went for bigger machines. Court had, at one stage, about 30 airframes operating out of Cape Town and Durban.
The Canal has always been vulnerable to events.
Titan Helicopters operate a fleet which includes Sikorski S61, Sikorski S-76, Mil Mi-8, Kamov Ka-32, Augusta AW139, Bell, and Eurocopter helicopters.