A couple of insights I would like to share with you about our experience with trikes.
I purchased one initially for my wife who has a vertigo condition aggravated by syncope. It has worked really well for her since she can't fall over and the feet and head being on nearly the same level helps a lot too. We have learned that when she parks to get off it is a really good idea to either have me standing right with her or to be at something she can lean/sit directly to more upright. The sudden standing up from the trike's low level has resulted in a few scary moments.