It all depends on what your description of a Trap gun is, plenty of world titles have been won with low rib guns that essentially shoot where you look and the only thing that gives them away as Trap is the beefier looking and higher combs, these would be perfectly comfortable on the Sporting scene and truth be told most top level shooters' guns are pretty close to this spec.
I have always maintained that so long as POI is not silly high most people would (eventually) benefit from a higher comb set up, I am also convinced beyond reasonable doubt that lowish ribs are better all rounders and since ESP includes a fair proportion of easy going aways as well as trickier shallow angle quartering birds then the choice should be a no brainer.
As Ed says get yourself a high end Perazzi or K80 second hand and enjoy the good engineering, personally I'd include a new DT11 (with Trap stock) or used DT10EELL in that search. The Miroku G5 is a sound gun but getting one when you can slap £7k on the table is like driving a a Skoda Yeti when you have the money for a Cayenne.