TpwUK,

"The corners at the front of the frame. Been there since the 1970's,"
I can not find any model with this corners can you show me?

"please refer to 92FS compact with Accessory Rail "
I also could not find model with "rails" like yours can you show me?

"The idea here is to reduce muzzle flip due to the excessive back end weight allowing the shooter to get back on target quicke"
I think make gun weight less on rear only make things worse in terms of muzzle flip. Because as I think weight compensate recoil, now all that energy will go to the hand and nothing changes.

Also do you think silicon will be reliable enough? I think grip must be solid enough to not allow gun to move in hand. But with silicon like material you will be not be able to fix gun in your hand especially after recoil because of nature of silicon like materials. And the thicker it will be the more problems we will have with fixation of hand and gun. Just notice you are going to consolidate silicon and grip with screws? It look very strange, because silicon is not solid, and all that screws will jib in your palm, Also it can not fix silicon and grip it is not a glue.
Also silicon like materials are not durable.