What makes it different in appearance from the Covico wheel used in the original Batboat is the spokes are not symmetrically spaced and there are four holes in each spoke instead of three. However, as far as I have found, this is as close you'll currently get to it in a new wheel.
An original Covico steering wheel offered by Glastron. They listed it as an option only in their 1966 catalog.
Here are details I turned up a while back on the steering wheel used in the original Batboat.
As of this writing, this new wheel is available as 15 inch width. To my eyes it looks about the same size used in the original Batboat. Covico steering wheels were available in 5 sizes ranging between 12 to 17 inches so who knows for sure.
I found a couple more photos clearly showing the Batboat steering wheel and will scan them later.