>>1003671I would imagine it depends largely on how much your inability to swim is caused by fear of drowning.
You fall off a bike, you're not gonna die, but even coughing on a bit of water can be fucking scary. Feels like you're gonna die.
As far as simple mechanics go, I think it's easier to learn how to doggy paddle from scratch than it is hopping on a two wheeled bike from the start. Balence is a hard thing to learn if you can't already do it.