Crow or Butterfly (whichever you want to call it ) is the "airbrake" setup. Large deflection downward flaps, large deflection upward ailerons. tons of drag and you've lost a lot more lift than you have gained. (its going to come down FAST)

You could make functional "real" airbrakes... surfaces that pop out of the sides or top of the fuselage (Or dual surffaces that clamshell open to about 160 deg from each other onthe wing tips, as the A-6 Intruder has... or the similar functiong surfaces at the rear of an F-16...) But the weight gain and mechanical complexity will make it undesireable for most modelers.

Note that an airbrake on the belly is rarely (if ever... I never saw one..) used. Probably has something to do with creating a pitch-down problem on final approach and/or dragging the airbrake n the runway...