What about making a bracket/mount and mounting under the panel near your throttle ? i admit it might be a nightmare to make a bracket.
Where do you think my knees go? Seriously, ask Footless Halls, who visited yesterday. I'm 5'5" and there is little room. He, as a normal 5 foot ? (maybe 6'?) ummm .... well taller than me anyway! had trouble squeezing in at all. The bit in the middle below the panel is where the stick stands when cruising, and my knees are just below the panel either side. You really have to sit in one of these small single seaters to appreciate what I mean!
SS