General aviation pilot reported unintended flap deployment during low altitude cruise flight resulting in a pitch up and an altitude excursion into Class B airspace.

Narrative

Was under ZZZ class B 1200 ft. ceiling near the waypoint. Holding 1000 ft. using autopilot.Uncomfortable because of the proximity to class B airspace; watching a line of weather moving across my front and my turbo controller apparently locked with the wastegate closed so my boost was much higher than normal. (Rotax 914 engine) I was cycling the throttle to diagnose the turbo problem at this time. Those distractions caused me to miss that I inadvertently touched the button for flaps. That caused the autopilot to start trying to pitch down but needed me to add trim down. This was yet another unexpected occurrence. This further distracted me and I missed that I was climbing rapidly. I realized I was already above 1200 ft. and could not understand what happened so rapidly. I pulled throttle to idle; disconnected autopilot and pitched steeply nose down. It took me several minutes to realize my flaps were at the first setting - which is for best climb. This is an experimental aircraft and I made an error placing the flap controller on the arm rest - so I wouldn't have to reach for it. I will need to build a 'gate' next to the buttons to prevent future inadvertent flap deployment. This has happened earlier in testing but I thought I had trained myself to keep my hand next to the buttons. I am happy to discuss further to clarify but bottom line; I believe human factors combined with poor placement of the flap buttons is the root cause.