If you don't mind something very unconventional, you might take a look at the Counterpoint Opus. The stoker sits in front in a recumbent position and the captain rides upright in back. Very cool but weird, and probably not cheap if you can even find one used. That's my suggestion.

I see Bilenky makes one in the same style, too.

Edit to add that Bilenky bought the patent from the original manufacturer.