A few suggestions:
Stay with a single selective trigger for a clays gun; a Model 21 with 32" barrels has about perfect dynamics for a clays gun; don't worry about modifying a gun you're going to use, regardless of what anyone else thinks.

I have a 32" RBL 12 with beavertail, single trigger, and pistol grip. It's a clays-killing machine.
JR


Be strong, be of good courage.
God bless America, long live the Republic.