Not to keep towing the Riffe Co. line (they're just what I'm familiar with) They offer euro shafts with mini shark fins. Of course, they're on this side of the world.
RIFFE INTERNATIONAL / Accessories - Page 1
My 75cm reef gun is somewhere between a mid, and a rear handle, it swings very nicely.
I'm really interested in the reversed trigger idea - what would that do to trigger position?