Of course, you don't need to recolor all the effects. It is possible to set output laser color according the RGB values of picture.
Go to Virtual device settings(right click on Virtual device and choose Device settings), now choose optimization. There is a Color balance tab. In this tab you can set output laser color balance.
In your case, you can just choose Presets->Single color laser projector and your effects should be drawn ok now.
To know more about color balance settings please read Fiesta! user manual.