I can’t answer any questions about the Kona other than to state the obvious of making sure that the boot is big enough for the wheelchair, as a few people on here have said that they would have loved one but for the fact that the boot was too small.
However, re hand controls, I would personally avoid Jeff Gosling ones. We had them on one car and the rod that links to the pedals sits underneath the steering column and I was forever whacking my knees on it when getting in and out of the car. Thanks to this forum another contributor recommended a different make (which, rather unhelpfully I can’t remember the name of, but if you search you will find the thread from early 2018) and the rods are fitted inside the steering column. They were ten times better and still free of charge. We had a different make again of steering ball and that was far better than the Jeff Gosling one as well (again, in the same thread).