Cable throttle...you're going to be stuck in lean burn the whole time? Or do you plan to have a lean burn off switch? Acceleration with very lean mixtures will be less efficient.
I feel like the best way to do this would be a wideband O2 sensor and standalone, that way you won't need to remember to manually put it on the original tune to make sure the fuel trims stay accurately calibrated. Along with a button for map switching of course, since your power will be quite limited. Lambda at full throttle is usually 0.9 (typically lower though, to protect catalysts and stuff), so if you're going to run lean your lambda should probably be no less than 1.3ish to reduce exhaust temperatures.
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