It's been mentioned in the past that this model is a consistent best-seller. I wonder, though, how many people actually use it for hunting (rather than a fixed blade) and how many just use it as a general utility knife. It might help guide your design if folks can give you some information on this topic specifically.
Another point to consider is the large price difference between the current FRN model and SS model. At $75, how well does the SS model sell? Some of the modifications mentioned might put the price in that range or beyond. With the Impala at over $100, I don't know how much room there is for high-end models here. On the other hand, the competitor's model (Kabar Dozier, with a lesser steel) is priced at $20. I think you are going to have to hit the $45 range with this knife to have a market. Your company, of course, has better data to decide this stuff, but these are some things that come to my mind.