If someone can show me an SOP that says flying below Green Dot is NOT permissible I would like to see it. VLS is the lowest selectable speed and is the minimum clean speed. Although I would not consider selecting and flying at VLS I think a sensible margin below Green Dot is perfectly acceptable if one can remain "clean". 'Normally' on arrival I see about 30kts between VLS and Green Dot. If Green Dot was 215 and ATC requirement is to fly 210 I consider selecting flap to be complete bollocks.
Regarding the speed brake; slightly tongue in cheek of course (as the entire thread is) however how often have we seen speed brakes used followed by a level segment either clean or semi-configured. The point here is a lack of appreciation of profiles.