Another way to get the same effect is to taper the ailerons.

Note there are several interesting features in this model (Top Flite Contender 60): angled-up wing tips trailing edges (low wing has slightly more lift), tapered silerons that end well inboard of tips, and a central apron flap (the one-piece orange section that extends underneath the fuselage) that drops for low-speed lift.  This wing has no dihedral at all (save the trailing edge of the tips) and yet is very forgiving over a wide range of speeds.



Another thought is that to help low speed handling the model should be balanced laterally.  If not it will have to be trimmed to fly level, and if trimmed at crusing speed it will likely have different characteristics at lower speed when the wing has less lift.