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None of the mods you describe will be easy, besides the K&N filter, which probably won't do anything.
The one thing that some ecomodders do that would NOT work on your engine would be a hot air intake, because you have no throttling losses, so cold air is best.
Toyota ECUs are notoriously difficult to crack, and even if you can get in, it would be hard to find how to control the idle speed while the car is moving.
I would check under the hood and see how many wires are coming out of your O2 sensor. If there are 5 wires on each sensor, you're in trouble. If you have 4, you have to replace all the sensors with wideband O2 sensors, and use an emulator like the Innovate LC1 to trick the ECU into thinking it's running at stoichiometric when it's actually running lean, but you can only lean it out a little bit with this trick. However with 3 O2 sensors you'd be looking at something like 700 bucks for this mod.
Since your engine is already so efficient, I would just forget about modifying it. Get your pulse and glide technique down, do what you can to lighten and streamline the car, and call it a day.
The other things you can do are going to be very involved, like putting synchronous rectifiers into the alternator, an electric water pump, etc.
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