You could always try a trike! No learning curve. Just need $$$$ to get a really good one.

Tale of three different 2-wheelers:
Some 2-wheeled recumbents are harder to learn on than others. My first, a horribly heavy and inefficient BikeE AT, is the perfect recumbent to get somebody hooked on recumbents but is not what I consider a bike for a serious rider. I let dozens of people have a try until the SACHS 3-speed hub gave out. Nobody ever fell off it even on the first try. It simply wasn't worth the cost to replace the hub or rear wheel. Once I moved on to a better bike I never again rode it myself. My old LWB Linear is just a little harder to ride. It has a low BB and easy reach to the ground from the seat. Most people are a bit wobbly at first but soon take to the bike. A couple minutes is all it takes. Not so with my Haluzak Horizon SWB. It suffers from heel strike and a bit higher seat though the BB is still low. I love riding it but it certainly isn't the easiest bike for a novice to try out. Talk about wobbly for a new rider!