techincally thrust vectoring and thrust reversers (clam shells) are basically the same.
Not quite...thrust reversers can cause the hot efflux to hit the airframe, which in the case of our models can either melt or burn. There is also a possibility of blowback into the fuselage which would be a very, very bad thing.
Now having said that....there is a video out there of a fellow in Germany who built one on a twin boom aircraft and seems to have it working just fine...