I have a spastic left leg, ankle and foot which causes a lot of pain and foot rests make it worse.
In the Kona I was able to remove it in a few minutes, the scenic I can’t as it is built in to the carpet. Try removing it or it would be easy enough to adapt, widen. Cut and shape some black uPVC sill board and tech-7 to the side of the footrest.
Easy done and it would not effect you when handing back. They will probably not notice and if they do it would be easy to remove as long as you don’t go mad with the glue.