If you go with a 750 engine from a 1997 or earlier model, you can forego the electronics - might be a simpler install in your project. Highly similar architecture and output but carb'd rather that FI.
Well #3, No performance parts are NOT generally available bu the engine does respond well to some basic external changes, exhaust intake etc.
At least one forum member in Norway has Turbo charged a VFR800, can't recall his name, but check on here with some searches.