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Let me see if I follow. You want to transplant a 1KR-FE engine into a 2012 Prius mated to a 6 speed manual gearbox? I am assuming you are not in the U.S. since you are referencing international motors, and that you understand the emissions and titling issues that may arise in your country of residence.
I have not done hours of extensive research on your behalf, so my answers are based off of my past experience with other U.S. Toyota engines (e.g. 1ZZ-FE, 2ZZ-GE, 2TR-FE). Most likely very little from the Prius is going to help you in terms of engine management, e.g. cruise, throttle, sensors, etcetera. I would personally only consider this swap if I had access to a complete donor vehicle with the 1KR-FE powertrain, and swap everything over, including ECU, cruise stalks, exhaust sensors, etcetera. I would also want to be a competent welder to move or relocate brackets. I would attempt to find a donor vehicle that used dimensionally the same front suspension components as the Prius, hopefully mixing and matching stock parts would eliminate the need for custom machining.
By start-stop I assume you mean a killswitch. Do a search.
I have transplanted electro-mechanical cruise control units, but I am assuming your engine is drive by wire, e.g. no throttle cable, so that is why I recommend complete swapping of all electronics.
LPG prices must be better where you are at, around here it is not significantly cheaper than gasoline per BTU. CNG pricing around here is better, but more expensive to set up due to high pressure tanks.
Warm up time can be accomplished with a vacuum insulated coolant storage tank or an exhaust based intake heater, which can be repurposed off of another vehicle.
I am assuming your talk of patents is a language barrier. Most of the ideas discussed on this site are already patented.
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