I'm not sure there's an official way is there? I think you just have to turn onto Westferry Road.
They should support cycle infrastructure - so many people who work in the Wharf ride in now and quite a lot come from south of the river, it would make it so much easier for them.
Didn't CW oppose the EW cycle superhighway?
https://www.theguardian.com/cities/2014/oct/10/lobbyist-canary-wharf-london-segregated-cycle-lane-crossrail-bikes
So it would be a real change for them to support cycling infrastructure.
How are you supposed to get from CS3 into Canary Wharf proper anyway? Using the lift next to Royal China?