Fallacy...you only need a hammer spring, trim the factory plunger spring, recoil spring of your choice, grips (if you so choose - because some people like the wood ones), guide rod, firing pin and a good polish job. No reason to replace the safeties, sear or FPB. Front sight of either black or fiber is a choice. You don't need a new hammer or a bolo. All of the things you listed are a choice of how you want your guns set up and more $ with little return to performance.
The Shadow 2 is a great feeling gun and a few spring changes and boom, lit!