The mongoose is a big release, but I shoot the L'il goose, and the scott caliper with equal ease off string loops, and with proper form. I don't know if you could ever screw the head back far enough into your palm to get what you want with the mongoose, but you could try. The loop doesn't add that much length to your set-up, maybe 1/2"-3/4"

When shooting a wrsits trap release with back tension, you can have your finger curled back so far that it's opposite the point of your thumb. It's not actualy good form to have the finger reaching way out there.